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{{Hatnote|This article is about the United States of America. For other uses of terms redirecting here, see [[US (disambiguation)]], [[USA (disambiguation)]], and [[United States (disambiguation)]].}}
<noinclude>{{pp-semi|small=yes}}{{pp-move-indef}}</noinclude>
{{Infobox country
|conventional_long_name = United States of America
|common_name = the United States
|image_flag = Flag_of_the_United_States_(Pantone).svg
|image_coat = US-GreatSeal-Obverse.svg
|length = 1776–present
|symbol_type = Great Seal
|national_motto = <!--Please read the talk page before editing these mottos:-->[[In God We Trust]]{{spaces|2}}<small>(official)</small><br />{{lang|la|''[[E pluribus unum|E Pluribus Unum]]''}}{{spaces|2}}<small>(traditional)</small><br /><small>([[Latin]]: Out of Many, One)</small>
|image_map = United States (orthographic projection).svg
|map_width = 220px
|national_anthem = "[[The Star-Spangled Banner]]"
|official_languages = None at federal level{{Ref label|engoffbox|a|}}
|languages_type = [[National language]]
|languages = [[American English|English]] (''[[de facto]]''){{Ref label|engfactobox|b|}}
|capital = [[Washington, D.C.]]
|largest_city = [[New York City]]
|latd = 38|latm=53|latNS=N|longd=77|longm=01|longEW=W
|government_type = [[Federalism|Federal]] [[Presidential system|presidential]] [[constitutional republic]]
|leader_title1 = [[President of the United States|President]]
|leader_name1 = [[Barack Obama]] ([[Democratic Party (United States)|D]])
|leader_title2 = [[Vice President of the United States|Vice President]]
|leader_name2 = [[Joe Biden]] ([[Democratic Party (United States)|D]])
|leader_title3 = {{nowrap|[[Speaker of the United States House of Representatives|Speaker of the House]]}}
|leader_name3 = [[John Boehner]] ([[Republican Party (United States)|R]])
|leader_title4 = [[Chief Justice of the United States|Chief Justice]]
|leader_name4 = [[John Roberts]]
|legislature = [[United States Congress|Congress]]
|upper_house = [[United States Senate|Senate]]
|lower_house = [[United States House of Representatives|House of Representatives]]
|sovereignty_type = [[American Revolutionary War|Independence]]
|sovereignty_note = from the [[Kingdom of Great Britain]]
|established_event1 = [[United States Declaration of Independence|Declared]]
|established_date1 = July 4, 1776
|established_event2 = [[Treaty of Paris (1783)|Recognized]]
|established_date2 = September 3, 1783
|established_event3 = [[United States Constitution|Current constitution]]
|established_date3 = June 21, 1788
|area_footnote = <ref name="WF"/>{{Ref label|areabox|c|}}
|area_sq_mi = 3794101
|area_km2 = 9826675
|area_rank = 3rd/4th
|area_magnitude = 1 E12
|percent_water = 6.76
|population_estimate = {{formatnum:{{data United States | Poptoday }} }}<ref name="POP">{{cite web|url=http://www.census.gov/population/www/popclockus.html|publisher=U.S. Census Bureau|title=U.S. POPClock Projection}} Figure updated automatically.</ref>
|population_estimate_year = 2012
|population_estimate_rank = 3rd
|population_density_km2 = 33.7
|population_density_sq_mi = 87.4
|GDP_PPP_year = 2011
|GDP_PPP = $15.094 trillion<ref name=IMF_GDP>{{cite web|url=http://www.imf.org/external/pubs/ft/weo/2012/01/weodata/weorept.aspx?pr.x=56&pr.y=10&sy=2009&ey=2012&scsm=1&ssd=1&sort=country&ds=.&br=1&c=111&s=NGDPD%2CNGDPDPC%2CPPPGDP%2CPPPPC%2CLP&grp=0&a=|title=United States|publisher=International Monetary Fund|accessdate=April 22, 2012}}</ref>
|GDP_PPP_rank = 1st
|GDP_PPP_per_capita = $48,386<ref name="IMF_GDP"/>
|GDP_PPP_per_capita_rank = 6th
|GDP_nominal = $15.094 trillion<ref name="IMF GDP"/>
|GDP_nominal_rank = 1st
|GDP_nominal_year = 2011
|GDP_nominal_per_capita = $48,386<ref name="IMF_GDP"/>
|GDP_nominal_per_capita_rank = 15th
|HDI_year = 2011
|HDI = {{increase}} 0.910<ref name="HDI">{{cite web|url=http://hdr.undp.org/en/media/HDR_2011_EN_Table1.pdf|title=Human Development Report 2011|year=2011|publisher=United Nations|accessdate=November 5, 2011}}</ref>
|HDI_rank = 4th
|HDI_category = <span style="color:#006000;">very high</span>
|EF_year = 2007
|EF = {{decrease}} 8.0 gha<ref name="EF">{{cite
web|url=http://www.footprintnetwork.org/images/uploads/Ecological_Footprint_Atlas_2010.pdf|title=Ecological Footprint Atlas 2010|publisher=Global Footprint Network|accessdate=July 11, 2011}}</ref>
|EF_rank = 6th
|Gini = 45.0<ref name="WF"/>
|Gini_rank = 39th
|Gini_year = 2007
|currency = [[United States dollar]] ($)
|currency_code = USD
|country_code = USA
|utc_offset = −5 to −10
|utc_offset_DST = −4 to −10
|cctld = [[.us]] [[.gov]] [[.mil]] [[.edu]]
|calling_code = [[North American Numbering Plan|+1]]
|date_format = m/d/yy ([[Anno Domini|AD]])
|drives_on = right
|demonym = [[Americans|American]]
|footnotes =
{{note|engoffbox}}a. English is the official language of at least 28 states—some sources give higher figures, based on differing definitions of "official".<ref name=ILW/> English and [[Hawaiian language|Hawaiian]] are both official languages in the state of [[Hawaii]].

{{note|engfactobox}}b. English is the ''de facto'' language of American government and the sole language spoken at home by 80% of Americans age five and older. Spanish is the [[Spanish language in the United States|second most commonly spoken language]].

{{note|areabox}}c. Whether the United States or [[China]] is larger is [[List of countries by area|disputed]]. The figure given is from the U.S. [[Central Intelligence Agency]]'s ''[[World Factbook]]''. Other sources give smaller figures. All authoritative calculations of the country's size include only the 50 states and the District of Columbia, not the territories.

{{note|popbox}}d. The population estimate includes people whose usual residence is in the fifty states and the District of Columbia, including noncitizens. It does not include either those living in the territories, amounting to more than 4&nbsp;million U.S. citizens (mostly in [[Puerto Rico]]), or U.S. citizens living outside the United States.
}}<!--
The opening paragraphs on this subject are a topic of great debate. Check the discussion page before editing. In particular, do ''not'' add mention of the territories to the first sentence: they are possessions of the United States, not part of it.
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The '''United States of America''' (commonly called the '''United States''', the '''U.S.''', the '''USA''', '''America''', and the '''States''') is a [[federalism|federal]] [[constitutional republic]] comprising [[U.S. state|fifty states]] and a [[federal district]]. The country is situated mostly in central [[North America]], where its [[Contiguous United States|forty-eight contiguous states]] and [[Washington, D.C.|Washington,&nbsp;D.C.]], the [[Capital districts and territories|capital district]], lie between the [[Pacific Ocean|Pacific]] and [[Atlantic Ocean]]s, [[Borders of the United States|bordered]] by [[Canada]] to the north and [[Mexico]] to the south. The state of [[Alaska]] is in the northwest of the continent, with Canada to the east and [[Russia]] to the west across the [[Bering Strait]]. The state of [[Hawaii]] is an [[archipelago]] in the mid-Pacific. The country also possesses [[Territories of the United States|several territories]] in the Pacific and [[Caribbean]].

At 3.79&nbsp;million square miles (9.83&nbsp;million km<sup>2</sup>) and with over 312 million people, the United States is the [[List of countries by area|third or fourth]] largest country by total area, and the third largest by both land area and [[List of countries by population|population]]. It is one of the world's most [[Multiethnic society|ethnically diverse]] and [[Multiculturalism|multicultural]] nations, the product of large-scale [[Immigration to the United States|immigration from many countries]].<ref name="DD">Adams, J. Q., and Pearlie Strother-Adams (2001). ''Dealing with Diversity''. Chicago: Kendall/Hunt. ISBN 0-7872-8145-X.</ref> The [[Economy of the United States|U.S.&nbsp;economy]] is the world's largest national economy, with an estimated 2011 [[Gross domestic product|GDP]] of $15.1&nbsp;trillion (22% of [[List of countries by GDP (nominal)|nominal global GDP]] and over 19% of global GDP at [[List of countries by GDP (PPP)|purchasing-power parity]]).<ref name="IMF GDP">{{cite web|url=http://www.imf.org/external/pubs/ft/weo/2011/02/weodata/weorept.aspx?sy=2009&ey=2011&scsm=1&ssd=1&sort=country&ds=.&br=1&c=111&s=NGDPD%2CNGDPDPC%2CPPPGDP%2CPPPPC%2CPPPSH%2CLP&grp=0&a=&pr.x=35&pr.y=14|publisher=International Monetary Fund|title=World Economic Outlook Database|month=September|year=2011|accessdate=September 11, 2011}}</ref><ref>The [[European Union]] has a larger collective economy, but is not a single nation.</ref> Per capita income is the world's [[List of countries by GDP (PPP) per capita|sixth-highest]].<ref name="IMF GDP" />

[[Indigenous peoples of the Americas|Indigenous peoples]] descended from [[Paleo-Indians|forebears]] who [[Settlement of the Americas|migrated from Asia]] have inhabited what is now the mainland United States for many thousands of years. This [[Native Americans in the United States|Native American population]] was greatly reduced by disease and warfare after [[European colonization of the Americas|European contact]]. The United States was founded by [[Thirteen Colonies|thirteen British colonies]] located along the Atlantic seaboard. On July&nbsp;4, 1776, they issued the [[United States Declaration of Independence|Declaration of Independence]], which proclaimed their right to [[self-determination]] and their establishment of a cooperative union. The rebellious states defeated the [[British Empire]] in the [[American Revolutionary War|American Revolution]], the first successful [[History of colonialism|colonial war of independence]].<ref>Dull, Jonathan R. (2003). "Diplomacy of the Revolution, to 1783", p. 352, chap. in ''A Companion to the American Revolution'', ed. Jack P. Greene and J. R. Pole. Maiden, Mass.: Blackwell, pp. 352–361. ISBN 1-4051-1674-9.</ref> The current [[United States Constitution]] was adopted on September&nbsp;17, 1787; its ratification the following year made the states part of a single republic with a stronger central government. The [[United States Bill of Rights|Bill of Rights]], comprising ten [[List of amendments to the United States Constitution|constitutional amendments]] guaranteeing many [[Natural and legal rights|fundamental civil rights and freedoms]], was ratified in 1791.

Through the 19th century, the United States displaced native tribes, acquired the [[Louisiana Purchase|Louisiana territory]] from France, [[Adams–Onís Treaty|Florida]] from Spain, part of the [[Oregon Country]] from the United Kingdom, [[Mexican Cession|Alta California and New Mexico]] from Mexico, and [[Alaska Purchase|Alaska]] from Russia, and annexed the [[Republic of Texas]] and the [[Republic of Hawaii]]. Disputes between the [[Southern United States|agrarian South]] and [[Northern United States|industrial North]] over the expansion of the [[slavery in the United States|institution of slavery]] and [[states' rights]] provoked the [[American Civil War|Civil War]] of the 1860s. The North's victory prevented a permanent split of the country and led to the [[Thirteenth Amendment to the United States Constitution|end of legal slavery]] in the United States. By the 1870s, its national economy was the world's largest.<ref>{{cite web |author=Maddison, Angus |url= http://www.ggdc.net/maddison/Historical_Statistics/horizontal-file_09-2008.xls |title=Historical Statistics for the World Economy |publisher=The Groningen Growth and Development Centre, Economics Department of the University of Groningen |year=2006 |accessdate=November 6, 2008}}</ref> The [[Spanish–American War]] and [[World War I|World War&nbsp;I]] confirmed the country's status as a military power. It emerged from [[World War II|World War&nbsp;II]] as the [[Nuclear weapons and the United States|first country with nuclear weapons]] and a permanent member of the [[United Nations Security Council]]. The end of the [[Cold War]] and the [[History of the Soviet Union (1982–1991)|dissolution of the Soviet Union]] left the United States as the sole [[superpower]]. The country accounts for 41% of [[List of countries by military expenditures|global military spending]],<ref>{{cite news |url=http://www.reuters.com/article/2011/07/07/military-spending-usa-idUSN1E7661J620110707 |title=US, Allies' Share of World Military Spending Shrinking—Study |work=Reuters |date=July 7, 2011 |accessdate=August 8, 2011}}</ref> and is a leading economic, political, and cultural force in the world.<ref>{{cite web|author=Cohen, Eliot A. |url= http://www.foreignaffairs.com/articles/59919/eliot-a-cohen/history-and-the-hyperpower |title= History and the Hyperpower |work=Foreign Affairs |date=July/August 2004 |accessdate=July 14, 2006}} {{cite news |url=http://news.bbc.co.uk/2/hi/americas/country_profiles/1217752.stm |title=Country Profile: United States of America |work=BBC News |date=April 22, 2008 |accessdate=May 18, 2008}}</ref>

==Etymology==
<!--linked-->
{{See also|Names for United States citizens}}

In 1507, German [[cartography|cartographer]] [[Martin Waldseemüller]] produced a world map on which he named the lands of the Western Hemisphere [[Americas|"America"]] after Italian explorer and cartographer [[Amerigo Vespucci]].<ref>{{cite news |url= http://www.usatoday.com/news/nation/2007-04-24-america-turns-500_N.htm?csp=34 |title= Cartographer Put 'America' on the Map 500 years Ago |work=USA Today |location =Washington, D.C. |date=April 24, 2007 |accessdate=November 30, 2008}}</ref> The former British colonies first used the country's modern name in the 1776 [[United States Declaration of Independence|Declaration of Independence]], the "unanimous Declaration of the thirteen united States of America".<!--Do not uppercase "united" here: it is unambiguously lowercased in the Declaration--><ref>{{cite web |url= http://www.archives.gov/exhibits/charters/charters.html |title=The Charters of Freedom |publisher=National Archives |accessdate=June 20, 2007}}</ref> On November&nbsp;15, 1777, the [[Second Continental Congress]] adopted the [[Articles of Confederation]], which states, "The Stile of this Confederacy shall be 'The United States of America'." The Franco-American treaties of 1778 used "United States of North America", but from July&nbsp;11, 1778, "United States of America" was used on the country's [[bills of exchange]], and it has been the official name ever since.<ref>{{cite news |author=McClure, James |url= http://www.ydr.com/ci_9569289 |title=A Primer: The 'First Capital' Debate |work=York Daily Record |date=June 12, 2008 |accessdate=July 26, 2010}}</ref>

The short form "United States" is also standard. Other common forms include the "U.S.", the "USA", and "America". Colloquial names include the "U.S. of A." and, internationally, the "States". "[[Columbia (name)|Columbia]]", a once popular name for the United States,<ref>{{cite web|title=Get to Know D.C.|url=http://www.historydc.org/aboutdc.aspx|publisher=Historical Society of Washington, D.C.|accessdate=2011-07-11}}</ref> derives from [[Christopher Columbus]]; it appears in the name "[[Washington, D.C.|District of Columbia]]".

The standard way to refer to a citizen of the United States is as an "[[Americans|American]]". Although "United States" is the official appositional term, "American" and "U.S." are more commonly used to refer to the country adjectivally ("American values", "U.S.&nbsp;forces"). "[[American (word)|American]]" is rarely used in English to refer to people not connected to the United States.<ref>Wilson, Kenneth G. (1993). ''The Columbia Guide to Standard American English''. New York: Columbia University Press, pp. 27–28. ISBN 0-231-06989-8.</ref>

The phrase "United States" was originally treated as plural—e.g., "the United States are"—including in the [[Thirteenth Amendment to the United States Constitution]], ratified in 1865. It became common to treat it as singular—e.g., "the United States is"—after the end of the Civil War. The singular form is now standard; the plural form is retained in the idiom "these United States".<ref>{{cite web |url= http://itre.cis.upenn.edu/~myl/languagelog/archives/002663.html |author=Zimmer, Benjamin |date=November 24, 2005 |title=Life in These, Uh, This United States |publisher=University of Pennsylvania—Language Log |accessdate=February 22, 2008}}</ref>

==History==
{{Main|History of the United States}}

===Native American and European settlement===
The [[Indigenous peoples of the Americas|indigenous peoples]] of the U.S. mainland, including [[Alaska Natives]], are believed to have [[Models of migration to the New World|migrated from Asia]], beginning between 40,000 and 12,000 years ago.<ref>{{cite web|url=http://anthropology.si.edu/HumanOrigins/faq/americas.htm|archiveurl=http://web.archive.org/web/20071128083459/http://anthropology.si.edu/HumanOrigins/faq/americas.htm|archivedate=November 28, 2007|title=Peopling of Americas|publisher=Smithsonian Institution, National Museum of Natural History|month=June|year=2004|accessdate=June 19, 2007}}</ref> Some, such as the [[pre-Columbian]] [[Mississippian culture]], developed advanced agriculture, grand architecture, and state-level societies. After [[European colonization of the Americas|Europeans began settling the Americas]], [[Population history of indigenous peoples of the Americas|many millions of indigenous Americans died]] from epidemics of imported diseases such as smallpox.<ref>{{Cite journal|author=Meltzer, D.J.|year=1992|title=How Columbus Sickened the New World: Why Were Native Americans So Vulnerable to the Diseases European Settlers Brought With Them?|journal=New Scientist|page=38|url=http://www.newscientist.com/article/mg13618424.700-how-columbus-sickened-the-new-world-why-were-nativeamericans-so-vulnerable-to-the-diseases-european-settlers-brought-with-them.html}}</ref>

[[File:MayflowerHarbor.jpg|thumb|The ''[[Mayflower]]'' transported [[Pilgrim (Plymouth Colony)|Pilgrims]] to the New World in 1620, as depicted in [[William Halsall]]'s ''The Mayflower in Plymouth Harbor'', 1882.]]
In 1492 while under contract to Spanish crown, [[Christopher Columbus]] discovered several Caribbean islands and making [[first contact (anthropology)|first contact]] with the indigenous people.<ref name="Hounshell1984">{{cite book|author=David A. Hounshell|title=From the American System to Mass Production, 1800-1932: The Development of Manufacturing Technology in the United States|url=http://books.google.com/books?id=_i9_AuEf-PwC&pg=PA130|date=1 April 1984|publisher=Wayne State University Press|isbn=978-0-8143-3279-5|page=130}}</ref> On April&nbsp;2, 1513, Spanish conquistador [[Juan Ponce de León]] landed on what he called "[[History of Florida|La Florida]]"—the first documented European arrival on what would become the U.S. mainland.<ref name="Miller1998">{{cite book|author=James J. Miller|title=An Environmental History of Northeast Florida|url=http://books.google.com/books?id=jnIKQL2BGvcC&pg=PA93|date=31 October 1998|publisher=University Press of Florida|isbn=978-0-8130-1600-9|page=93}}</ref> Spanish settlements in the region were followed by ones in the present-day [[southwestern United States]] that drew thousands through Mexico. French fur traders established outposts of [[New France]] around the Great Lakes; France eventually claimed much of the North American interior, down to the Gulf of Mexico.<ref name="White2012">{{cite book|author=G. Edward White|title=Law in American History: From the Colonial Years Through the Civil War|url=http://books.google.com/books?id=-xNmdt2BNRIC&pg=PA44|date=20 February 2012|publisher=Oxford University Press|isbn=978-0-19-510247-5|page=44}}</ref> The first successful English settlements were the [[Colony of Virginia|Virginia Colony]] in [[Jamestown, Virginia|Jamestown]] in 1607 and the [[Pilgrim (Plymouth Colony)|Pilgrims]]' [[Plymouth Colony]] in 1620.<ref name="Graddol1996">{{cite book|author=David Graddol|title=English: History, Diversity and Change|url=http://books.google.com/books?id=H8dtjSeWSigC&pg=PA194|year=1996|publisher=Psychology Press|isbn=978-0-415-13118-6|page=194}}</ref> The 1628 chartering of the [[Massachusetts Bay Colony]] resulted in a wave of migration; by 1634, [[New England]] had been settled by some 10,000 [[Puritan]]s. Between the late 1610s and the American Revolution, about 50,000 convicts were shipped to Britain's American colonies.<ref>{{cite web|last=Butler|first= James Davie|work=American Historical Review 2|title=British Convicts Shipped to American Colonies|publisher=Smithsonian Institution, National Museum of Natural History|month=October|year=1896|accessdate=June 21, 2007}}</ref> Beginning in 1614, the Dutch settled along the lower [[Hudson River]], including [[New Amsterdam]] on [[Manhattan|Manhattan Island]].<ref name="Reps1992">{{cite book|author=John W. Reps|title=The Making of Urban America: A History of City Planning in the United States|url=http://books.google.com/books?id=ES4m9SedVZkC&pg=PA147|date=15 June 1992|publisher=Princeton University Press|isbn=978-0-691-00618-5|page=147}}</ref>

In 1674, the Dutch ceded their American territory to England; the province of [[New Netherland]] was renamed New York.<ref name="NortonSheriff2008">{{cite book|author1=Mary Beth Norton|author2=Carol Sheriff|author3=David W. Blight|coauthors=David M. Katzman, Howard Chudacoff|title=A People & a Nation: A History of the United States to 1877|url=http://books.google.com/books?id=Ir86E8BAUOAC&pg=PA59|date=30 December 2008|publisher=Cengage Learning|isbn=978-0-547-17559-1|page=59}}</ref> Many new immigrants, especially to [[History of the Southern United States|the South]], were indentured servants—some two-thirds of all Virginia immigrants between 1630 and 1680.<ref>Russell, David Lee (2005). ''The American Revolution in the Southern Colonies''. Jefferson, N.C., and London: McFarland, p. 12. ISBN 0-7864-0783-2.</ref> By the turn of the 18th century, [[Slavery in the colonial United States|African slaves]] were becoming the primary source of bonded labor in many regions.<ref name="Quirk2011">{{cite book|author=Joel Quirk|title=The Anti-Slavery Project: From the Slave Trade to Human Trafficking|url=http://books.google.com/books?id=qqxK4KlqKYMC&pg=PA195|date=26 May 2011|publisher=University of Pennsylvania Press|isbn=978-0-8122-4333-8|page=195}}</ref> With the 1729 division of [[the Carolinas]] and the 1732 colonization of [[Georgia (U.S. state)|Georgia]], the [[Thirteen Colonies|thirteen British colonies]] that would become the United States of America were established.<ref name="BilhartzElliott2007">{{cite book|author1=Terry D. Bilhartz|author2=Alan C. Elliott|title=Currents in American History: A Brief History of the United States|url=http://books.google.com/books?id=J65Z_Ura2EIC&pg=PA7|date=28 February 2007|publisher=M.E. Sharpe|isbn=978-0-7656-1817-7}}</ref> All had local governments with elections open to most free men, with a growing devotion to the ancient [[rights of Englishmen]] and a sense of self-government stimulating support for republicanism. All legalized the [[African slave trade]].<ref name="Wood1998">{{cite book|author=Gordon S. Wood|title=The Creation of the American Republic, 1776-1787|url=http://books.google.com/books?id=kdDRJLxBhl4C&pg=PA263|date=6 April 1998|publisher=UNC Press Books|isbn=978-0-8078-4723-7|page=263}}</ref> With high birth rates, low death rates, and steady immigration, the colonial population grew rapidly. The [[Christian revival]]ist movement of the 1730s and 1740s known as the [[First Great Awakening|Great Awakening]] fueled interest in both religion and religious liberty. In the [[French and Indian War]], British forces seized Canada from the French, but the [[francophone]] population remained politically isolated from the southern colonies. Excluding the [[Native Americans in the United States|Native Americans]] (popularly known as "American Indians"), who were being displaced, those thirteen colonies had a population of 2.6&nbsp;million in 1770, about one-third that of Britain; nearly one in five Americans were black slaves.<ref>Blackburn, Robin (1998). ''The Making of New World Slavery: From the Baroque to the Modern, 1492–1800''. London and New York: Verso, p. 460. ISBN 1-85984-195-3.</ref> Though [[No taxation without representation|subject to British taxation]], the American colonials had no representation in the [[Parliament of Great Britain]].

===Independence and expansion===
[[File:Declaration independence.jpg|thumb|left|''[[Trumbull's Declaration of Independence|Declaration of Independence]]'', by [[John Trumbull]], 1817–18]]
Tensions between American colonials and the British during the [[American Revolution|revolutionary period]] of the 1760s and early 1770s led to the [[American Revolutionary War]], fought from 1775 to 1781. On June&nbsp;14, 1775, the [[Second Continental Congress|Continental Congress]], convening in [[Philadelphia]], established a [[Continental Army]] under the command of [[George Washington]]. Proclaiming that "[[all men are created equal]]" and endowed with "certain [[Natural and legal rights|unalienable Rights]]", the Congress adopted the [[United States Declaration of Independence|Declaration of Independence]], drafted largely by [[Thomas Jefferson]], on July&nbsp;4, 1776. That date is now celebrated annually as America's [[Independence Day (United States)|Independence Day]]. In 1777, the [[Articles of Confederation]] established a weak [[confederation|confederal]] government that operated until 1789.

After the [[Siege of Yorktown|British defeat]] by American forces [[France in the American Revolutionary War|assisted by the French]] and [[Spain in the American Revolutionary War|Spanish]], Great Britain [[Treaty of Paris (1783)|recognized the independence of the United States]] and the states' sovereignty over American territory west to the [[Mississippi River]]. Those wishing to establish a strong federal government with powers of taxation organized a [[Philadelphia Convention|constitutional convention]] in 1787. The [[United States Constitution]] was ratified in 1788, and the new republic's [[1st United States Congress|first Senate, House of Representatives]], and [[President of the United States|president]]—George Washington—took office in 1789. The [[United States Bill of Rights|Bill of Rights]], forbidding federal restriction of [[Natural rights|personal freedoms and guaranteeing a range of legal protections]], was adopted in 1791.

Attitudes toward [[Slavery in the United States|slavery]] were shifting; a [[Denied powers|clause in the Constitution]] protected the [[Atlantic slave trade]] only until 1808. The Northern states abolished slavery between 1780 and 1804, leaving the [[slave state]]s of the South as defenders of the "[[peculiar institution]]". The [[Second Great Awakening]], beginning about 1800, made [[evangelicalism]] a force behind various social reform movements, including [[abolitionism]].

[[File:U.S. Territorial Acquisitions.png|thumb|Territorial acquisitions by date]]
Americans' eagerness to [[Territorial acquisitions of the United States|expand westward]] prompted a long series of [[American Indian Wars|Indian Wars]]. The [[Louisiana Purchase]] of French-claimed territory under President Thomas Jefferson in 1803 almost doubled the nation's size.<ref>{{cite web|title=Louisiana Purchase|url=http://www.nps.gov/archive/jeff/lewisclark2/circa1804/heritage/louisianapurchase/louisianapurchase.htm|work=National Parks Services|accessdate=March 1, 2011}}</ref> The [[War of 1812]], declared against Britain over various grievances and fought to a draw, strengthened U.S. nationalism. A series of U.S. military incursions into Florida led [[Adams–Onís Treaty|Spain to cede]] it and other Gulf Coast territory in 1819. The [[Trail of Tears]] in the 1830s exemplified the [[Indian removal]] policy that stripped the native peoples of their land. The United States annexed the [[Republic of Texas]] in 1845, amid a period when the concept of [[Manifest Destiny]] was becoming popular.<ref>Morrison, Michael A. (1999). ''Slavery and the American West: The Eclipse of Manifest Destiny and the Coming of the Civil War''. Chapel Hill: University of North Carolina Press, pp. 13–21. ISBN 0-8078-4796-8.</ref> The 1846 [[Oregon Treaty]] with Britain led to U.S. control of the present-day [[Northwestern United States|American Northwest]]. The U.S. victory in the [[Mexican-American War]] resulted in the [[Mexican Cession|1848 cession]] of [[California]] and much of the present-day [[Southwestern United States|American Southwest]]. The [[California Gold Rush]] of 1848–49 further spurred western migration. [[Rail transport in the United States#History|New railways]] made relocation easier for settlers and increased conflicts with Native Americans. Over a half-century, up to 40 million [[American bison]], or buffalo, were slaughtered for skins and meat and to ease the railways' spread. The loss of the buffalo, a primary resource for the [[plains Indians]], was an existential blow to many native cultures.

===Civil War and industrialization===
[[File:Battle of Gettysburg, by Currier and Ives.png|thumb|left|''[[Battle of Gettysburg]]'', lithograph by [[Currier and Ives|Currier & Ives]], ca. 1863]]
[[Origins of the American Civil War|Tensions]] between [[slave and free states]] mounted with arguments about the relationship between the [[states' rights|state and federal governments]], as well as [[Bleeding Kansas|violent conflicts]] over the spread of slavery into new states. [[Abraham Lincoln]], candidate of the largely antislavery [[Republican Party (United States)|Republican Party]], was elected president in 1860. Before he took office, seven slave states declared their secession—which the federal government maintained was illegal—and formed the [[Confederate States of America]]. With the Confederate [[Battle of Fort Sumter|attack upon Fort Sumter]], the [[American Civil War|Civil War]] began and four more slave states joined the Confederacy. Lincoln's [[Emancipation Proclamation]] in 1863 declared slaves in the Confederacy to be free. Following the [[Union (American Civil War)|Union]] victory in 1865, three amendments to the U.S. Constitution [[Thirteenth Amendment to the United States Constitution|ensured freedom]] for the nearly four million [[African American]]s who had been slaves,<ref>{{cite web |url= http://www2.census.gov/prod2/decennial/documents/1860a-02.pdf |title=1860 Census |publisher=U.S. Census Bureau |accessdate=June 10, 2007}} Page 7 lists a total slave population of 3,953,760.</ref> [[Fourteenth Amendment to the United States Constitution|made them citizens]], and [[Fifteenth Amendment to the United States Constitution|gave them voting rights]]. The war and its resolution led to a substantial increase in [[Federalism in the United States|federal power]].<ref>De Rosa, Marshall L. (1997). ''The Politics of Dissolution: The Quest for a National Identity and the American Civil War''. Edison, NJ: Transaction. p. 266. ISBN 1-56000-349-9.</ref> The war remains the deadliest conflict in American history, resulting in the deaths of 620,000 soldiers.<ref>Vinovskis, Maris (1990). "''[http://books.google.com/books?id=gySktxKYPGoC&pg=PA6 Toward a social history of the American Civil War: exploratory essays]''". Cambridge University Press. p. 6. ISBN 0-521-39559-3.</ref>

[[File:Ellis island 1902.jpg|thumb|Immigrants at [[Ellis Island]], [[New York Harbor]], 1902]]
After the war, the [[assassination of Abraham Lincoln]] [[Radical Republicans|radicalized Republican]] [[Reconstruction Era of the United States|Reconstruction]] policies aimed at reintegrating and rebuilding the Southern states while ensuring the rights of the newly freed slaves. The resolution of the disputed [[United States presidential election, 1876|1876 presidential election]] by the [[Compromise of 1877]] ended Reconstruction; [[Jim Crow laws]] soon [[Disfranchisement after Reconstruction era|disenfranchised many African Americans]]. In the North, urbanization and an unprecedented [[Immigration to the United States#History|influx of immigrants]] from Southern and Eastern Europe hastened the [[United States technological and industrial history#Technological systems and infrastructure|country's industrialization]]. The wave of immigration, lasting until 1929, provided labor and transformed American culture. National infrastructure development spurred economic growth. The 1867 [[Alaska Purchase]] from Russia completed the country's mainland expansion. The [[Wounded Knee Massacre]] in 1890 was the last major armed conflict of the Indian Wars. In 1893, the [[Ancient Hawaii|indigenous monarchy]] of the Pacific [[Kingdom of Hawaii]] was overthrown in a coup led by American residents; the United States annexed the archipelago in 1898. Victory in the [[Spanish–American War]] the same year demonstrated that the United States was a [[Great power|world power]] and led to the annexation of Puerto Rico, Guam, and the [[Philippines]].<ref>{{cite web |author=Gates, John M. |url= http://www3.wooster.edu/History/jgates/book-ch3.html |title=War-Related Deaths in the Philippines |work=Pacific Historical Review |publisher=College of Wooster |date=August 1984 |accessdate=September 27, 2007}}</ref> The Philippines gained independence a half-century later; Puerto Rico and Guam remain U.S. territories.

===World War I, Great Depression, and World War II===
[[File:Dust Bowl&nbsp;- Dallas, South Dakota 1936.jpg|thumb|left|An abandoned farm in [[South Dakota]] during the [[Dust Bowl]], 1936]]
At the outbreak of World War I in 1914, the United States remained neutral. Most Americans sympathized with the British and French, although many opposed intervention.<ref>Foner, Eric; Garraty, John A. (1991). ''The Reader's Companion to American History.'' New York: Houghton Mifflin. p. 576. ISBN 0-395-51372-3.</ref> In 1917, the United States joined the [[Allies of World War I|Allies]], and the [[American Expeditionary Forces]] helped to turn the tide against the [[Central Powers]]. After the war, the Senate did not ratify the [[Treaty of Versailles]], which established the [[League of Nations]]. The country pursued a policy of unilateralism, verging on [[United States non-interventionism|isolationism]].<ref>McDuffie, Jerome; Piggrem, Gary Wayne; Woodworth, Steven E. (2005). ''U.S. History Super Review''. Piscataway, NJ: Research & Education Association. p. 418. ISBN 0-7386-0070-9.</ref> In 1920, the women's rights movement won passage of a [[Nineteenth Amendment to the United States Constitution|constitutional amendment]] granting [[Women's suffrage in the United States|women's suffrage]]. The prosperity of the [[Roaring Twenties]] ended with the [[Wall Street Crash of 1929]] that triggered the [[Great Depression in the United States|Great Depression]]. After his election as president in 1932, [[Franklin D. Roosevelt]] responded with the [[New Deal]], a range of policies increasing government intervention in the economy, including the establishment of the [[Social Security (United States)|Social Security]] system.<ref>{{cite book |title= Social Welfare: A History of the American Response to Need |first1= June |last1= Axinn |first2= Mark J. |last2=Stern |isbn=978-0-205-52215-6 |edition=7th |publisher=Allyn & Bacon |location=Boston |year=2007}}</ref> The [[Dust Bowl]] of the mid-1930s impoverished many farming communities and spurred a new wave of western migration.
[[File:Into the Jaws of Death 23-0455M edit.jpg|thumb|Soldiers of the [[U.S. Army]] [[1st Infantry Division (United States)|1st Infantry Division]] [[Invasion of Normandy|landing in Normandy]] on [[Normandy landings|D-Day]], June 6, 1944]]
The United States, effectively neutral during [[Military history of the United States during World War II|World War II]]'s early stages after Nazi Germany's [[invasion of Poland]] in September 1939, began supplying materiel to the [[Allies of World War II|Allies]] in March 1941 through the [[Lend-Lease]] program. On December 7, 1941, the Empire of Japan launched a surprise [[attack on Pearl Harbor]], prompting the United States to join the Allies against the [[Axis powers]] as well as the [[internment of Japanese Americans]] by the thousands.<ref>{{cite web |author=Burton, Jeffrey F., et al. |url= http://www.nps.gov/history/history/online_books/anthropology74/ce3.htm |title= A Brief History of Japanese American Relocation During World War II |work= Confinement and Ethnicity: An Overview of World War II Japanese American Relocation Sites |date=July 2000 |accessdate=April 2, 2010 |publisher=National Park Service}}</ref> Participation in the war spurred capital investment and industrial capacity. Among the major combatants, the United States was the only nation to become richer—indeed, far richer—instead of poorer because of the war.<ref>Kennedy, Paul (1989). ''The Rise and Fall of the Great Powers''. New York: Vintage. p. 358. ISBN 0-679-72019-7.</ref> Allied conferences at [[United Nations Monetary and Financial Conference|Bretton Woods]] and [[Yalta Conference|Yalta]] outlined a new system of international organizations that placed the [[United States and the United Nations|United States]] and [[Soviet Union and the United Nations|Soviet Union]] at the center of world affairs. As [[Victory in Europe Day|victory was won in Europe]], a 1945 [[United Nations Conference on International Organization|international conference]] held in [[San Francisco]] produced the [[United Nations Charter]], which became active after the war.<ref>{{cite web |url= http://www.state.gov/r/pa/ho/pubs/fs/55407.htm |archiveurl= http://web.archive.org/web/20070612221444/http://www.state.gov/r/pa/ho/pubs/fs/55407.htm |archivedate= June 12, 2007 |title=The United States and the Founding of the United Nations, August 1941&nbsp;– October 1945 |month=October |year=2005 |accessdate=June 11, 2007 |publisher=U.S. Dept. of State, Bureau of Public Affairs, Office of the Historian}}</ref> The United States, having [[Manhattan Project|developed the first nuclear weapons]], used them on the Japanese cities of [[atomic bombings of Hiroshima and Nagasaki|Hiroshima and Nagasaki]] in August. [[Surrender of Japan|Japan surrendered]] on September 2, ending the war.<ref>Pacific War Research Society (2006). ''Japan's Longest Day''. New York: Oxford University Press. ISBN 4-7700-2887-3.</ref>

===Cold War and protest politics===
[[File:Martin Luther King&nbsp;- March on Washington.jpg|thumb|left|upright|[[Martin Luther King, Jr.]] delivering his "[[I Have a Dream]]" speech, 1963]]
The United States and the Soviet Union jockeyed for power after World War II during the [[Cold War]], dominating the military affairs of Europe through [[NATO]] and the [[Warsaw Pact]], respectively. While they engaged in [[proxy war]]s and developed powerful nuclear arsenals, the two countries avoided direct military conflict. The U.S. often opposed [[Third World]] left-wing movements that it viewed as Soviet-sponsored. American troops fought Communist Chinese and North Korean forces in the [[Korean War]] of 1950–53. The [[House Un-American Activities Committee]] pursued a series of investigations into suspected leftist subversion, while Senator [[Joseph McCarthy]] became the figurehead of anticommunist sentiment.

The 1961 Soviet launch of the [[Vostok 1|first manned spaceflight]] prompted President [[John F. Kennedy]]'s call for the United States to be first to land [[Apollo program|"a man on the moon"]], achieved in 1969. Kennedy also faced a [[Cuban Missile Crisis|tense nuclear showdown]] with Soviet forces in Cuba. Meanwhile, the United States experienced sustained economic expansion. A growing [[African-American Civil Rights Movement (1955–1968)|civil rights movement]], symbolized and led by African Americans such as [[Rosa Parks]] and [[Martin Luther King, Jr.]], used [[nonviolence]] to confront segregation and discrimination. Following [[John F. Kennedy assassination|Kennedy's assassination]] in 1963, the [[Civil Rights Act of 1964]] and [[Voting Rights Act|Voting Rights Act of 1965]] were passed under President [[Lyndon B. Johnson]].<ref>{{cite book |last=Dallek |first= Robert |year=2004 |title=Lyndon B. Johnson: Portrait of a President |page=169 |publisher=Oxford University Press |isbn=978-0-19-515920-2}}</ref><ref>{{cite web |url= http://www.ourdocuments.gov/doc.php?flash=old&doc=97 |title=Our Documents&nbsp;– Civil Rights Act (1964) |publisher=United States Department of Justice |accessdate=July 28, 2010}}</ref> He also signed into law the [[Medicare (United States)|Medicare]] and [[Medicaid]] programs.<ref>[http://www.ssa.gov/history/lbjsm.html Social Security History], the United States [[Social Security Administration]]</ref> Johnson and his successor, [[Richard Nixon]], expanded a proxy war in Southeast Asia into the unsuccessful [[Vietnam War]]. A widespread [[counterculture of the 1960s|countercultural movement]] grew, fueled by [[Opposition to the Vietnam War|opposition to the war]], [[black nationalism]], and the [[sexual revolution]]. [[Betty Friedan]], [[Gloria Steinem]], and others led a [[Feminism in the United States|new wave of feminism]] that sought political, social, and economic equality for women.

As a result of the [[Watergate scandal]], in 1974 Nixon became the first U.S. president to resign, to avoid being [[impeachment|impeached]] on charges including obstruction of justice and abuse of power. The [[Jimmy Carter]] administration of the late 1970s was marked by [[stagflation]] and the [[Iran hostage crisis]]. The election of [[Ronald Reagan]] as president in 1980 heralded a [[Conservatism in the United States|rightward shift in American politics]], reflected in major changes in [[Reaganomics|taxation and spending priorities]]. His second term in office brought both the [[Iran–Contra affair|Iran-Contra scandal]] and significant [[Cold War (1985–1991)|diplomatic progress with the Soviet Union]]. The subsequent Soviet collapse ended the Cold War.

===Contemporary era===
[[File:UA Flight 175 hits WTC south tower 9-11 edit.jpeg|thumb|The [[World Trade Center]] on the morning of [[September 11 attacks|September 11, 2001]]]]
Under President [[George H. W. Bush]], the United States took a lead role in the UN–sanctioned [[Gulf War]]. The longest economic expansion in modern U.S. history—from March 1991 to March 2001—encompassed the [[Bill Clinton]] administration and the [[dot-com bubble]].<ref>{{cite web|author=Voyce, Bill|url=http://iwin.iwd.state.ia.us/iowa/ArticleReader?itemid=00003700&print=1|title=Why the Expansion of the 1990s Lasted So Long|publisher=Iowa Workforce Information Network|date=2006-08-21|accessdate=2007-08-16}}</ref> A [[Paula Jones|civil lawsuit]] and [[Lewinsky scandal|sex scandal]] led to [[Impeachment of Bill Clinton|Clinton's impeachment]] in 1998, but he remained in office. The [[United States presidential election, 2000|2000 presidential election]], one of the closest in American history, was resolved by a [[Bush v. Gore|U.S. Supreme Court decision]]—[[George W. Bush]], son of George H. W. Bush, became president.

On [[September 11 attacks|September 11, 2001]], [[al-Qaeda]] terrorists struck the [[World Trade Center]] in New York City and [[The Pentagon]] near Washington, D.C., killing nearly three thousand people. In response, the [[Presidency of George W. Bush|Bush administration]] launched the global [[War on Terror]], [[War in Afghanistan (2001–present)|invading Afghanistan]] and removing the [[Taliban]] government and al-Qaeda training camps. [[Taliban insurgency|Taliban insurgents]] continue to fight a guerrilla war. In 2002, the Bush administration began to press for regime change in Iraq on [[Rationale for the Iraq War|controversial grounds]].<ref>{{cite news|title=Many Europeans Oppose War in Iraq|work=USA Today|url=http://www.usatoday.com/news/world/2003-02-14-eu-survey.htm|date=2003-02-14|accessdate=2008-09-01}}</ref> [[Coalition of the willing|Forces led by the U.S.]] [[2003 invasion of Iraq|invaded Iraq]] in 2003, ousting [[Saddam Hussein]]. In 2005, [[Hurricane Katrina]] caused severe destruction along much of the [[Gulf Coast of the United States|Gulf Coast]], devastating [[New Orleans]]. In 2008, amid a global [[Late-2000s recession|economic recession]], the first African American president, [[Barack Obama]], was elected. Major [[Health care reform in the United States|health care]] and [[Dodd-Frank Wall Street Reform and Consumer Protection Act|financial system]] reforms were enacted two years later. In 2011, a raid by [[Navy SEAL]]s in [[Pakistan]] killed al-Qaeda leader [[Osama bin Laden]]. The [[Iraq War]] officially ended with the pullout of the remaining U.S. troops from the country in December 2011.

==Government and politics==
[[File:Capitol Building Full View.jpg|thumb|The west front of the [[United States Capitol]], which houses the [[United States Congress|U.S. Congress]]]]
{{Main|Federal government of the United States|state governments of the United States|elections in the United States}}
The United States is the world's oldest surviving [[federation]]. It is a [[constitutional republic]] and [[representative democracy]], "in which [[majority rule]] is tempered by [[minority rights]] protected by [[Law of the United States|law]]".<ref>Scheb, John M., and John M. Scheb II (2002). ''An Introduction to the American Legal System''. Florence, KY: Delmar, p. 6. ISBN 0-7668-2759-3.</ref> The government is regulated by a system of [[separation of powers|checks and balances]] defined by the U.S. Constitution, which serves as the country's supreme legal document.<ref>{{cite web | url=http://www.senate.gov/civics/constitution_item/constitution.htm | title=Constitution of the United States | publisher=The Office of the Secretary of the Senate | work=The Office of the Secretary of the Senate | accessdate=February 11, 2012 | author=Killian, Johnny H.}}</ref> In the [[Federalism#United States|American federalist system]], citizens are usually subject to [[Political divisions of the United States|three levels of government]], federal, state, and local; the [[Local government in the United States|local government]]'s duties are commonly split between [[County (United States)|county]] and municipal governments. In almost all cases, executive and legislative officials are elected by a [[plurality voting system|plurality vote]] of citizens by district. There is no [[proportional representation]] at the federal level, and it is very rare at lower levels.

[[File:WhiteHouseSouthFacade.JPG|thumb|left|The south façade of the [[White House]], home and workplace of the [[President of the United States|U.S. president]]]]
The federal government is composed of three branches:
* [[Legislature|Legislative]]: The [[bicameralism|bicameral]] [[United States Congress|Congress]], made up of the [[United States Senate|Senate]] and the [[United States House of Representatives|House of Representatives]], makes [[federal law]], [[declaration of war|declares war]], approves treaties, has the [[power of the purse]], and has the power of [[impeachment]], by which it can remove sitting members of the government.
* [[Executive (government)|Executive]]: The [[President of the United States|president]] is the [[commander-in-chief]] of the military, can veto [[bill (proposed law)|legislative bills]] before they become law, and appoints the [[United States Cabinet|members of the Cabinet]] (subject to Senate approval) and other officers, who administer and enforce federal laws and policies.
* [[Judiciary|Judicial]]: The [[Supreme Court of the United States|Supreme Court]] and lower [[United States federal courts|federal courts]], whose judges are appointed by the president with Senate approval, interpret laws and overturn those they find [[constitutionality|unconstitutional]].

[[File:USSupremeCourtWestFacade.JPG|thumb|The west front of the [[United States Supreme Court Building]]]]
The House of Representatives has 435 voting members, each representing a [[congressional district]] for a two-year term. House seats are [[United States congressional apportionment|apportioned]] among the states by population every tenth year. As of the [[United States Census, 2000|2000 census]], seven states have the minimum of one representative, while California, the most populous state, has fifty-three. The Senate has 100 members with each state having two senators, elected [[at-large]] to six-year terms; one third of Senate seats are up for election every other year. The president serves a four-year term and may be elected to the office [[Term limits in the United States|no more than twice]]. The president is [[United States presidential election|not elected by direct vote]], but by an indirect [[United States Electoral College|electoral college]] system in which the determining votes are apportioned to the states and the [[District of Columbia]]. The Supreme Court, led by the [[Chief Justice of the United States]], has nine members, who serve for life.

The state governments are structured in roughly similar fashion; [[Nebraska]] uniquely has a [[unicameral]] legislature. The [[Governor (United States)|governor]] (chief executive) of each state is directly elected. Some state judges and cabinet officers are appointed by the governors of the respective states, while others are elected by popular vote.

The original text of the Constitution establishes the structure and responsibilities of the federal government and its relationship with the individual states. [[Article One of the United States Constitution|Article One]] protects the right to the "great writ" of [[Habeas corpus in the United States|habeas corpus]], and [[Article Three of the United States Constitution|Article Three]] guarantees the [[Jury trial#United States|right to a jury trial]] in all criminal cases. [[Article Five of the United States Constitution|Amendments to the Constitution]] require the approval of three-fourths of the states. The Constitution has been amended twenty-seven times; the first ten amendments, which make up the [[United States Bill of Rights|Bill of Rights]], and the [[Fourteenth Amendment to the United States Constitution|Fourteenth Amendment]] form the central basis of Americans' individual rights. All laws and governmental procedures are subject to [[judicial review]] and any law ruled in violation of the Constitution is voided. The principle of judicial review, not explicitly mentioned in the Constitution, was declared by the Supreme Court in ''[[Marbury v. Madison]]'' (1803).

===Parties and ideology===
{{Main|Politics of the United States|Political ideologies in the United States}}
[[File:Barack Obama&nbsp;- ITN.jpg|thumb|upright|[[Barack Obama]] taking the [[Oath of office of the President of the United States|presidential oath of office]] from U.S. Chief Justice [[John Roberts]], January 20, 2009]]
The United States has operated under a [[two-party system]] for most of its history.<ref name=twsNovGe>{{cite news
|author= Eric Etheridge with Asger Deleith
|title= A Republic or a Democracy?
|publisher= ''The New York Times''
|quote= The US system seems essentially a two-party system. ...
|date= August 19, 2009
|url= http://opinionator.blogs.nytimes.com/2009/08/19/a-republic-or-a-democracy/
|accessdate= 2010-11-07
}}</ref> For elective offices at most levels, state-administered [[primary election]]s choose the major party nominees for subsequent [[general election]]s. Since the [[United States presidential election, 1856|general election of 1856]], the major parties have been the [[Democratic Party (United States)|Democratic Party]], [[History of the Democratic Party (United States)|founded in 1824]], and the [[Republican Party (United States)|Republican Party]], [[History of the United States Republican Party|founded in 1854]]. Since the Civil War, only one [[Third party (United States)|third-party]] presidential candidate—former president [[Theodore Roosevelt]], running as a [[Progressive Party (United States, 1912)|Progressive]] in [[United States presidential election, 1912|1912]]—has won as much as 20% of the popular vote.

Within American [[political culture]], the Republican Party is considered center-right or [[Conservatism in the United States|conservative]] and the Democratic Party is considered center-left or [[Modern liberalism in the United States|liberal]].<ref>{{cite book |last=Grigsby |first=Ellen|title=Analyzing Politics: An Introduction to Political Science |publisher=Cengage Learning |year=2008 |isbn=0-495-50112-3 | pages = 106–7}}</ref> The states of the [[Northeastern United States#Politics|Northeast]] and [[Western United States#Politics|West Coast]] and some of the Great Lakes states, known as "[[Red states and blue states|blue states]]", are relatively liberal. The "[[Political party strength in U.S. states|red states]]" of the [[Politics of the Southern United States|South]] and parts of the [[Midwestern United States#Political trends|Great Plains]] and [[Western United States#Politics|Rocky Mountains]] are relatively conservative.

The winner of the [[United States presidential election, 2008|2008 presidential election]], Democrat [[Barack Obama]], is the [[List of Presidents of the United States|44th U.S. president]]. The [[United States elections, 2010|2010 midterm elections]] saw the Republican Party [[United States House of Representatives elections, 2010|take control of the House]] and [[United States Senate elections, 2010|make gains in the Senate]], where the Democrats retain the majority. In the [[112th United States Congress]], the Senate comprises 51 Democrats, two [[independent (politician)|independents]] who caucus with the Democrats, and 47 Republicans; the House comprises 242 Republicans and 192 Democrats—one seat is vacant. There are 29 Republican and 20 Democratic [[List of current United States governors|state governors]], as well as one independent.

==Foreign relations and military==
{{Main|Foreign policy of the United States|United States Armed Forces}}
[[File:Hague Clinton May 14 2010 Crop.jpeg|thumb|British Foreign Secretary [[William Hague]] and [[U.S. Secretary of State]] [[Hillary Clinton]], May 2010]]

The United States exercises global economic, political, and military influence. It is a permanent member of the [[United Nations Security Council]] and New York City hosts the [[United Nations Headquarters]]. It is a member of the [[G8]],<ref>{{cite web | url=http://www.g8.utoronto.ca/what_is_g8.html | title=What is the G8? | publisher=University of Toronto | work=utoronto.ca | accessdate=February 11, 2012}}</ref> [[G-20 major economies|G20]], and [[Organisation for Economic Co-operation and Development]]. Almost all countries have [[List of diplomatic missions in the United States|embassies]] in Washington, D.C., and many have [[consul (representative)|consulates]] around the country. Likewise, nearly all nations host [[List of diplomatic missions of the United States|American diplomatic missions]]. However, [[Cuba&nbsp;– United States relations|Cuba]], [[United States-Iran relations|Iran]], [[North Korea&nbsp;– United States relations|North Korea]], [[Bhutan]], and the [[Republic of China]] (Taiwan) do not have formal diplomatic relations with the United States.

The United States has a "[[special relationship]]" with the [[United Kingdom&nbsp;– United States relations|United Kingdom]]<ref>{{cite news|url=http://www.dailymail.co.uk/news/article-1390800/Obama-reaffirms-special-relationship-US-historic-speech-MPs.html|title=Brotherhood of the Burger Kings: Obama and Cameron Hail 'Stronger than Ever' Special Relationship|publisher=Mail Online| date=2011-05-26|accessdate=2011-08-28|location=London|first=James|last=Chapman}}</ref> and strong ties with [[Canada&nbsp;– United States relations|Canada]],<ref>{{cite web|url=http://www.fas.org/sgp/crs/row/96-397.pdf|title=Canada–U.S. Relations|author=Ek, Carl, and Ian F. Fergusson|publisher=Congressional Research Service| date=2010-09-03|accessdate=2011-08-28}}</ref> [[United States-Australia relations|Australia]],<ref>{{cite web|url=http://www.worldcat.org/title/australia-background-and-us-relations/oclc/70208969?title=&detail=&page=frame&url=http%3A%2F%2Fwww.fas.org%2Fsgp%2Fcrs%2Frow%2FRL33010.pdf%26checksum%3Df2a13dd063242d8cf4b00dfda18441af&linktype=digitalObject|title=Australia: Background and U.S. Relations|author=Vaughn, Bruce|publisher=Congressional Research Service| date=2008-08-08|accessdate=2011-08-28}}</ref> [[New Zealand&nbsp;– United States relations|New Zealand]],<ref>{{cite web|url=http://www.fas.org/sgp/crs/row/RL32876.pdf|title=New Zealand: Background and Bilateral Relations with the United States|author=Vaughn, Bruce|publisher=Congressional Research Service| date=2011-05-27|accessdate=2011-08-28}}</ref> [[Philippines&nbsp;- United States relations|the Philippines]],<ref>{{cite web|url=http://www.fas.org/sgp/crs/row/RL33233.pdf|title=The Republic of the Philippines and U.S. Interests|author=Lum, Thomas|publisher=Congressional Research Service| date=2011-01-03|accessdate=2011-08-03}}</ref> [[Japan&nbsp;– United States relations|Japan]],<ref>{{cite web|url=http://www.fas.org/sgp/crs/row/RL33436.pdf|title=Japan-U.S. Relations: Issues for Congress|author=Chanlett-Avery, Emma, et al.|publisher=Congressional Research Service| date=2011-06-08|accessdate=2011-08-28}}</ref> [[South Korea&nbsp;– United States relations|South Korea]],<ref>{{cite web|url=http://www.fas.org/sgp/crs/row/R41481.pdf|title=U.S.–South Korea Relations: Issues for Congress|author=Manyin, Mark E., Emma Chanlett-Avery, and Mary Beth Nikitin|publisher=Congressional Research Service| date=2011-07-08|accessdate=2011-08-28}}</ref> [[Israel&nbsp;– United States relations|Israel]],<ref>{{cite web|url=http://www.fas.org/sgp/crs/mideast/RL33476.pdf|title=Israel: Background and U.S. Relations|author=Addis, Casey L.|publisher=Congressional Research Service| date=2011-02-14|accessdate=2011-08-28}}</ref> and several European countries. It works closely with fellow [[NATO]] members on military and security issues and with its neighbors through the [[Organization of American States]] and [[United States free trade agreements|free trade agreements]] such as the trilateral [[North American Free Trade Agreement]] with Canada and [[United States-Mexico relations|Mexico]]. In 2008, the United States spent a net $25.4 billion on [[official development assistance]], the most in the world. As a share of America's large [[gross national income]] (GNI), however, the U.S. contribution of 0.18% ranked last among twenty-two donor states. By contrast, private overseas giving by Americans is relatively generous.<ref>{{cite web|author=Shah, Anup|title=US and Foreign Aid Assistance|date=2009-04-13|publisher=GlobalIssues.org|url=http://www.globalissues.org/article/35/us-and-foreign-aid-assistance|accessdate=2009-10-11}}</ref>
[[File:USS Abraham Lincoln(CVN 72).jpg|thumb|left|The [[USS Abraham Lincoln (CVN-72)|USS ''Abraham Lincoln'']] [[aircraft carrier]]]]

The president holds the title of commander-in-chief of the nation's armed forces and appoints its leaders, the [[United States Secretary of Defense|secretary of defense]] and the [[Joint Chiefs of Staff]]. The [[United States Department of Defense]] administers the armed forces, including the [[United States Army|Army]], [[United States Navy|Navy]], [[United States Marine Corps|Marine Corps]], and [[United States Air Force|Air Force]]. The [[United States Coast Guard|Coast Guard]] is run by the [[United States Department of Homeland Security|Department of Homeland Security]] in peacetime and the [[United States Department of the Navy|Department of the Navy]] in time of war. In 2008, the armed forces had 1.4 million personnel on active duty. The [[Reserve component of the Armed Forces of the United States|Reserves]] and [[National Guard of the United States|National Guard]] brought the total number of troops to 2.3 million. The Department of Defense also employed about 700,000 civilians, not including contractors.<ref>{{cite web|url=http://www.airforce-magazine.com/MagazineArchive/Magazine%20Documents/2009/May%202009/0509facts_fig.pdf|title=The Air Force in Facts and Figures (Armed Forces Manpower Trends, End Strength in Thousands)|work=Air Force Magazine|date=May 2009|accessdate=2009-10-09}}</ref>

Military service is voluntary, though [[Conscription in the United States|conscription]] may occur in wartime through the [[Selective Service System]].<ref>{{cite web | url=http://www.sss.gov/what.htm | title=WHAT DOES SELECTIVE SERVICE PROVIDE FOR AMERICA? | publisher=Selective Service System | work=www.sss.gov | accessdate=February 11, 2012}}</ref> American forces can be rapidly deployed by the Air Force's large fleet of transport aircraft, the Navy's eleven active aircraft carriers, and [[Marine Expeditionary Unit]]s at sea with the Navy's [[United States Fleet Forces Command|Atlantic and]] [[United States Pacific Fleet|Pacific fleets]]. The military operates 865 bases and facilities abroad,<ref>{{cite web|url=http://www.defense.gov/pubs/BSR_2008_Baseline.pdf|title=Base Structure Report, Fiscal Year 2008 Baseline|publisher=Department of Defense|accessdate=2009-10-09}}</ref> and maintains [[Deployments of the United States Military|deployments greater than 100 active duty personnel]] in 25 foreign countries.<ref>{{cite web|url=http://siadapp.dmdc.osd.mil/personnel/MILITARY/history/hst1003.pdf|title=Active Duty Military Personnel Strengths by Regional Area and by Country (309A)|publisher=Department of Defense|date=2010-03-31|accessdate=2010-10-07}}</ref> The extent of this global military presence has prompted some scholars to describe the United States as maintaining an "empire of bases".<ref>{{cite web|author=Ikenberry, G. John|url=http://people.cas.sc.edu/rosati/ttp.ikenberry.empirereviews.fa.march04.htm|title=Illusions of Empire: Defining the New American Order|work=Foreign Affairs|date=March/April 2004}} {{cite web|author=Kreisler, Harry, and Chalmers Johnson|url=http://globetrotter.berkeley.edu/people4/CJohnson/cjohnson-con3.html|title=Conversations with History|publisher=University of California at Berkeley|date=2004-01-29|accessdate=2007-06-21}}</ref>

Total U.S. military spending in 2010, almost $700 billion, was 43% of global military spending and greater than the next fourteen largest national military expenditures combined. At 4.8% of GDP, the rate was the second-highest among the top fifteen military spenders, after [[Saudi Arabia]].<ref>{{cite web|url=http://www.sipri.org/research/armaments/milex/resultoutput/15majorspenders|title=The 15 Countries with the Highest Military Expenditure in 2010|publisher=Stockholm International Peace Research Institute|accessdate=2012-02-05}}</ref> The proposed base [[military budget of the United States|Department of Defense budget]] for 2012, $553 billion, is a 4.2% increase over 2011; an additional $118 billion is proposed for the military campaigns in Iraq and Afghanistan.<ref>{{cite web|url= http://comptroller.defense.gov/defbudget/fy2012/FY2012_Budget_Request_Overview_Book.pdf|title=Fiscal Year 2012 Budget Request Overview |publisher=Department of Defense|date=February 2011|accessdate=2011-07-25}}</ref> The last American troops serving in Iraq departed in December 2011;<ref>{{cite news|author=Basu, Moni|url=http://www.cnn.com/2011/12/17/world/meast/iraq-troops-leave/index.html?hpt=hp_t1 |title=Deadly Iraq War Ends with Exit of Last U.S. Troops|publisher=CNN |date=2011-12-18 |accessdate=2012-02-05}}</ref> 4,484 servicemen were killed during the [[Iraq War]].<ref>{{cite web|url=http://icasualties.org/Iraq/index.aspx|title=Operation Iraqi Freedom|publisher=Iraq Coalition Casualty Count|date=2012-02-05|accessdate=2012-02-05}}</ref> Approximately 90,000 U.S. troops were serving in Afghanistan as of April 2012;<ref>{{cite web|url=http://www.frontline.in/stories/20120420290705200.htm|author=Cherian, John|title=Turning Point|publisher=Frontline|date=2012-04-20|accessdate=2012-04-04}}{{dead link|date=May 2012}}</ref> as of April 4, 1,924 had been killed during the [[War in Afghanistan (2001–present)|War in Afghanistan]].<ref>{{cite web|url=http://icasualties.org/OEF/index.aspx|title=Operation Enduring Freedom|publisher=Iraq Coalition Casualty Count|date=2012-04-04|accessdate=2012-04-04}}</ref>

==Economy==
{{Main|Economy of the United States}}

{| class="infobox" style="font-size: 90%; border: 1px solid #999; float: right; margin-left: 1em; width: 270px;"
|- style="background:#f5f5f5;"
! colspan="3" | Economic indicators
|-
| [[Unemployment in the United States|Unemployment]] || 8.2% <small>(May 2012)</small> || style="text-align: right;" | <ref>{{cite web|url=http://www.bls.gov/news.release/empsit.nr0.htm|title=Employment Situation Summary|publisher=U.S. Dept. of Labor|date=2012-06-01|accessdate=2012-06-01}}</ref>
|-
| GDP growth || 1.9% <small>(1Q 2012)</small>, 1.7% <small>(2011)</small>|| style="text-align: right;" | <ref>{{cite web|url=http://www.bea.gov/newsreleases/national/gdp/gdpnewsrelease.htm|title=National Income and Product Accounts Gross Domestic Product, 1st Quarter 2012 (Advance Estimate)|publisher=Bureau of Economic Analysis|date=2012-04-27 |accessdate=2012-05-08}} Change is based on [[chained dollars|chained 2005 dollars]]. Quarterly growth is expressed as an annualized rate.</ref>
|-
| [[Consumer price index|CPI]] inflation || 1.7% <small>(May 2011&nbsp;– May 2012)</small> || style="text-align: right;" | <ref>{{cite web|url=http://www.bls.gov/news.release/cpi.nr0.htm|title=Consumer Price Index: May 2012|publisher=Bureau of Labor Statistics|date=2012-06-14|accessdate=2012-06-27}}</ref>
|-
| [[Poverty in the United States|Poverty]] || 15.1% <small>(2010)</small> || style="text-align: right;" | <ref name=CBPR10>{{cite web|url=http://www.census.gov/prod/2011pubs/p60-239.pdf|title=Income, Poverty, and Health Insurance Coverage in the United States: 2010|publisher=U.S. Census Bureau|date=2010-09-14|accessdate=2011-09-16}}</ref>
|-
| [[United States public debt|Public debt]] || $15.78 trillion <small>(June 25, 2012)</small> || style="text-align: right;" | <ref>{{cite web|url=http://www.treasurydirect.gov/NP/BPDLogin?application=np|title=Debt Statistics|publisher=U.S. Dept. of the Treasury|accessdate=2012-06-27}}</ref>
|-
| [[Wealth in the United States|Household net worth]] || $58.5 trillion <small>(4Q 2011)</small> || style="text-align: right;" | <ref>{{cite web|url=http://www.federalreserve.gov/releases/Z1/Current/z1r-1.pdf|title=Flow of Funds Accounts of the United States: Flows and Outstandings Fourth Quarter 2011|publisher=U.S. Federal Reserve|date=2012-03-08|accessdate=2012-04-17}}</ref>
|}

The United States has a capitalist [[mixed economy]], which is fueled by abundant natural resources, a well-developed infrastructure, and high productivity.<ref>Wright, Gavin, and Jesse Czelusta, "Resource-Based Growth Past and Present", in ''Natural Resources: Neither Curse Nor Destiny'', ed. Daniel Lederman and William Maloney (World Bank, 2007), p. 185. ISBN 0-8213-6545-2.</ref> According to the [[International Monetary Fund]], the U.S. GDP of $15.1 trillion constitutes 22% of the [[gross world product]] at market exchange rates and over 19% of the gross world product at [[purchasing power parity]] (PPP).<ref name="IMF GDP"/> Though larger than any other nation's, its national GDP was about 5% smaller at PPP in 2011 than the [[European Union]]'s, whose population is around 62% higher.<ref>{{cite web|url=http://epp.eurostat.ec.europa.eu/cache/ITY_PUBLIC/3-28072011-AP/EN/3-28072011-AP-EN.PDF |title=EU27 Population 502.5 Million at 1 January 2011|publisher=Eurostat Press Office |format=PDF |date=2011-07-28 |accessdate=2012-06-19}}</ref> The country ranks ninth in the world in [[List of countries by GDP (nominal) per capita|nominal GDP per capita]] and sixth in [[List of countries by GDP (PPP) per capita|GDP per capita at PPP]].<ref name="IMF GDP"/> The [[United States dollar|U.S. dollar]] is the world's primary [[reserve currency]].<ref>{{cite web|url=http://www.imf.org/external/np/sta/cofer/eng/cofer.pdf |title=Currency Composition of Official Foreign Exchange Reserves |publisher=International Monetary Fund|format=PDF |date= |accessdate=2012-04-09}}</ref>

The United States is the [[List of countries by imports|largest importer]] of goods and [[List of countries by exports|third largest exporter]], though [[List of countries by exports per capita|exports per capita]] are relatively low. In 2010, the total [[U.S. trade deficit]] was $635 billion.<ref name=Trade>{{cite web|title=Trade Statistics|url=http://greyhill.com/trade-statistics|publisher=Greyhill Advisors|accessdate=2011-10-06}}</ref> Canada, China, Mexico, Japan, and Germany are its top trading partners.<ref>{{cite web|url=http://www.census.gov/foreign-trade/top/dst/current/balance.html|title=Top Ten Countries with which the U.S. Trades|publisher=U.S. Census Bureau|date=August 2009|accessdate=2009-10-12}}</ref> In 2010, oil was the largest import commodity, while transportation equipment was the country's largest export.<ref name=Trade/> China is the largest foreign holder of U.S. public debt.<ref>{{cite web|url=http://www.csmonitor.com/USA/Politics/DC-Decoder/2011/0204/National-debt-Whom-does-the-US-owe|title=National debt: Whom does the US owe?|publisher=CSMonitor.com|date=2011-02-04|accessdate=2011-07-14}}</ref>

[[File:Wall-Street Nueva York6397.JPG|thumb|left|[[Wall Street]] and the [[New York Stock Exchange]], the world's largest bourse by dollar volume<ref>{{cite web|url=http://ir.nyse.com/phoenix.zhtml?c=129145&p=irol-newsArticle&ID=1036503&highlight=|title=New Release/Ultra Petroleum Corp.,|publisher=NYSE Euronext|date=2007-07-03|accessdate=2007-08-03}}</ref>]]
In 2009, the private sector was estimated to constitute 86.4% of the economy, with federal government activity accounting for 4.3% and state and local government activity (including federal transfers) the remaining 9.3%.<ref>{{cite web|url=http://greyhill.com/gdp-by-industry/ |title=GDP by Industry|publisher=Greyhill Advisors|accessdate=2011-10-13}}</ref> While its economy has reached a [[post-industrial society|postindustrial]] level of development and its [[Tertiary sector of economic activity|service sector]] constitutes 67.8% of GDP, the United States remains an industrial power.<ref name=Econ>{{cite web|url=http://usinfo.state.gov/products/pubs/economy-in-brief/page3.html|archiveurl=http://web.archive.org/web/20080312123609/http://usinfo.state.gov/products/pubs/economy-in-brief/page3.html|archivedate=2008-03-12|accessdate=2008-03-12|title=USA Economy in Brief|publisher=U.S. Dept. of State, International Information Programs}}</ref> The leading business field by gross business receipts is wholesale and retail trade; by net income it is manufacturing.<ref>{{cite web|url=http://www.census.gov/compendia/statab/2009/tables/09s0724.xls|title=Table 724—Number of Tax Returns, Receipts, and Net Income by Type of Business and Industry: 2005|publisher=U.S. Census Bureau|accessdate=2009-10-12}}</ref> Chemical products are the leading manufacturing field.<ref>{{cite web|url=http://www.census.gov/compendia/statab/2009/tables/09s0964.xls|title=Table 964—Gross Domestic Product in Current and Real (2000) Dollars by Industry: 2006|publisher=U.S. Census Bureau|date=May 2008|accessdate=2009-10-12}}</ref> The United States is the third largest producer of oil in the world, as well as its largest importer.<ref>{{cite web|url=https://www.cia.gov/library/publications/the-world-factbook/rankorder/2173rank.html|title=Rank Order—Oil (Production)|publisher=CIA|work=The World Factbook|accessdate=2009-10-12}}{{cite web|url=https://www.cia.gov/library/publications/the-world-factbook/rankorder/2174rank.html|title=Rank Order—Oil (Consumption)|publisher=CIA|work=The World Factbook|accessdate=2009-10-12}}{{cite web|url=http://www.eia.doe.gov/pub/oil_gas/petroleum/data_publications/company_level_imports/current/import.html|title=Crude Oil and Total Petroleum Imports Top 15 Countries|publisher=U.S. Energy Information Administration|date=2009-09-29|accessdate=2009-10-12}}</ref> It is the world's number one producer of electrical and nuclear energy, as well as liquid natural gas, sulfur, phosphates, and salt. While [[Agriculture in the United States|agriculture]] accounts for just under 1% of GDP,<ref name=Econ/> the United States is the world's top producer of corn<ref>{{cite web|url=http://www.grains.org/page.ww?section=Barley,+Corn+%26+Sorghum&name=Corn|archiveurl=http://web.archive.org/web/20080112182404/http://www.grains.org/page.ww?section=Barley,+Corn+%26+Sorghum&name=Corn|archivedate=2008-01-12|title=Corn|publisher=U.S. Grains Council|accessdate=2008-03-13}}</ref> and soybeans.<ref>{{cite web|url=http://www.worldwatch.org/node/5442|title=Soybean Demand Continues to Drive Production|publisher=Worldwatch Institute|date=2007-11-06|accessdate=2008-03-13}}</ref> [[Coca-Cola]] and [[McDonald's]] are the two most recognized brands in the world.<ref>{{cite web|url=http://www.cheskin.com/view_news.php?id=2|title=Sony, LG, Wal-Mart among Most Extendible Brands|publisher=Cheskin|date=2005-06-06|accessdate=2007-06-19}}</ref>

In August 2010, the American labor force comprised 154.1 million people. With 21.2 million people, government is the leading field of employment. The largest private employment sector is health care and social assistance, with 16.4 million people. About 12% of workers are [[Labor unions in the United States|unionized]], compared to 30% in Western Europe.<ref>{{cite web|author=Fuller, Thomas|url=http://www.iht.com/articles/2005/06/14/news/europe.php|title=In the East, Many EU Work Rules Don't Apply|date=2005-06-15|work=International Herald Tribune|accessdate=2007-06-28}}</ref> The World Bank ranks the United States first in the ease of hiring and firing workers.<ref name="EDBI">{{cite web|url=http://www.doingbusiness.org/ExploreEconomies/?economyid=197|accessdate=2007-06-28|title=Doing Business in the United States (2006)|publisher=World Bank}}</ref> In 2009, the United States had the third highest labor productivity per person in the world, behind Luxembourg and Norway. It was fourth in productivity per hour, behind those two countries and the Netherlands.<ref>{{cite web|url=http://www.conference-board.org/data/economydatabase/|title=Total Economy Database, Summary Statistics, 1995–2010|publisher=The Conference Board|work=The Conference Board Total Economy Database|date=September 2010|accessdate=2009-09-20}}</ref> Compared to Europe, U.S. property and corporate [[Taxation in the United States|income tax rates]] are generally higher, while labor and, particularly, consumption tax rates are lower.<ref>{{cite news|author=Gumbel, Peter|url=http://www.time.com/time/magazine/article/0,9171,662737-2,00.html|title=Escape from Tax Hell|date=2004-07-11|work=Time|accessdate=2007-06-28}}</ref>

==Geography and environment==
{{Main|Geography of the United States|Climate of the United States|Environment of the United States}}
The land area of the [[contiguous United States]] is {{convert|2959064|sqmi|km2|0}}. Alaska, separated from the contiguous United States by Canada, is the largest state at {{convert|663268|sqmi|km2|0}}. Hawaii, occupying an archipelago in the central Pacific, southwest of North America, is {{convert|10931|sqmi|km2|0}} in area.<ref>{{cite web|author=Lubowski, Ruben; Vesterby, Marlow; Bucholtz, Shawn |url= http://www.ers.usda.gov/publications/arei/eib16/chapter1/1.1/|title=AREI Chapter 1.1: Land Use |publisher= Economic Research Service |date=July 21, 2006|accessdate=March 9, 2009}}</ref> The United States is the world's third or fourth [[List of countries by area|largest nation by total area]] (land and water), ranking behind Russia and Canada and just above or below [[China]]. The ranking varies depending on how two territories disputed by China and [[India]] are counted and how the total size of the United States is measured: calculations range from {{convert|3676486|sqmi|km2|0}}<ref>{{cite web |url=http://www.britannica.com/EBchecked/topic/616563/United-States |title= United States |publisher= Encyclopædia Britannica |accessdate=March 25, 2008 (area given in square miles)}}</ref> to {{convert|3717813|sqmi|km2|0}}<ref>{{cite web |url= http://unstats.un.org/unsd/demographic/products/dyb/DYB2005/Table03.pdf |title=Population by Sex, Rate of Population Increase, Surface Area and Density |publisher=UN Statistics Division |work= Demographic Yearbook 2005 |accessdate=March 25, 2008 (area given in square kilometers)}}</ref> to {{convert|3794101|sqmi|km2|0}}.<ref name="WF">{{cite web |url= https://www.cia.gov/library/publications/the-world-factbook/geos/us.html |title=United States |publisher=CIA |work=The World Factbook |date=September 30, 2009 |accessdate=January 5, 2010 (area given in square kilometers)}}</ref> Including only land area, the United States is third in size behind Russia and China, just ahead of Canada.<ref>{{cite web |url= http://web.archive.org/web/20080208233209rn_1/education.yahoo.com/reference/factbook/countrycompare/area/3d.html |title=World Factbook: Area Country Comparison Table |publisher=Yahoo Education |accessdate=February 28, 2007}}</ref>
[[File:Haliaeetus leucocephalus2.jpg|thumb|upright|left|The [[Bald Eagle]], national bird of the United States since 1782]]

The coastal plain of the Atlantic seaboard gives way further inland to [[deciduous]] forests and the rolling hills of the [[Piedmont (United States)|Piedmont]]. The [[Appalachian Mountains]] divide the eastern seaboard from the [[Great Lakes]] and the grasslands of the [[Midwestern United States|Midwest]]. The [[Mississippi River|Mississippi]]–[[Missouri River]], the world's [[List of rivers by length|fourth longest river system]], runs mainly north–south through the heart of the country. The flat, fertile [[prairie]] of the [[Great Plains]] stretches to the west, interrupted by [[U.S. Interior Highlands|a highland region]] in the southeast. The [[Rocky Mountains]], at the western edge of the Great Plains, extend north to south across the country, reaching altitudes higher than 14,000&nbsp;feet (4,300&nbsp;m) in [[Colorado]]. Farther west are the rocky [[Great Basin]] and deserts such as the [[Chihuahua Desert|Chihuahua]] and [[Mojave Desert|Mojave]]. The [[Sierra Nevada (U.S.)|Sierra Nevada]] and [[Cascade Range|Cascade]] mountain ranges run close to the [[West Coast of the United States|Pacific coast]]. At 20,320&nbsp;feet (6,194&nbsp;m), Alaska's [[Mount McKinley]] is the tallest peak in the country and in North America. Active [[volcano]]es are common throughout Alaska's [[Alexander Archipelago|Alexander]] and [[Aleutian Islands]], and Hawaii consists of volcanic islands. The [[supervolcano]] underlying [[Yellowstone National Park]] in the Rockies is the continent's largest volcanic feature.<ref>{{cite web |url= http://dsc.discovery.com/convergence/supervolcano/under/under.html |title=Supervolcano: What's Under Yellowstone? |author=O'Hanlon, Larry |publisher=Discovery Channel |accessdate=June 13, 2007}}</ref>

The United States, with its large size and geographic variety, includes most climate types. To the east of the [[100th meridian west|100th meridian]], the climate ranges from [[humid continental climate|humid continental]] in the north to [[humid subtropical climate|humid subtropical]] in the south. The southern tip of [[Florida]] is tropical, as is Hawaii. The Great Plains west of the 100th meridian are semi-arid. Much of the Western mountains are [[alpine climate|alpine]]. The climate is arid in the Great Basin, desert in the Southwest, [[Mediterranean climate|Mediterranean]] in [[coastal California]], and [[oceanic climate|oceanic]] in coastal [[Oregon]] and [[Washington (state)|Washington]] and southern Alaska. Most of Alaska is subarctic or polar. Extreme weather is not uncommon—the states bordering the [[Gulf of Mexico]] are prone to [[Tropical cyclone|hurricanes]], and most of the world's [[tornado]]es occur within the country, mainly in the Midwest's [[Tornado Alley]].<ref>{{cite news |author=Perkins, Sid |url= http://www.sciencenews.org/articles/20020511/bob9.asp |archiveurl= http://web.archive.org/web/20070701131631/http://www.sciencenews.org/articles/20020511/bob9.asp |archivedate=July 1, 2007 |title=Tornado Alley, USA |accessdate=September 20, 2006 |date=May 11, 2002 |work= Science News}}</ref>

The U.S. ecology is considered "[[megadiverse countries|megadiverse]]": about 17,000 species of [[vascular plants]] occur in the contiguous United States and Alaska, and over 1,800 species of [[flowering plant]]s are found in Hawaii, few of which occur on the mainland.<ref>{{cite web |author= Morin, Nancy |url= http://www.fungaljungal.org/papers/National_Biological_Service.pdf |title=Vascular Plants of the United States |publisher= National Biological Service |work=Plants |accessdate=October 27, 2008}}</ref> The United States is home to more than 400 mammal, 750 bird, and 500 reptile and amphibian species.<ref>{{cite web |url= http://www.sdi.gov/curtis/TxTab4x1.html |title= Global Significance of Selected U.S. Native Plant and Animal Species |publisher=SDI Group |date=February 9, 2001 |accessdate=January 20, 2009}}</ref> About 91,000 insect species have been described.<ref>{{cite web |url= http://www.si.edu/Encyclopedia_SI/nmnh/buginfo/bugnos.htm |title=Numbers of Insects (Species and Individuals) |publisher=Smithsonian Institution |accessdate=January 20, 2009}}</ref> The [[Endangered Species Act]] of 1973 protects threatened and endangered species and their habitats, which are monitored by the [[United States Fish and Wildlife Service]]. There are fifty-eight [[List of areas in the United States National Park System|national parks]] and hundreds of other federally managed parks, forests, and [[wilderness]] areas.<ref>{{cite press release |url= http://home.nps.gov/applications/release/Detail.cfm?ID=639 |title=National Park Service Announces Addition of Two New Units |publisher=National Park Service |date=February 28, 2006 |accessdate=June 13, 2006}}</ref> Altogether, the government owns 28.8% of the country's land area.<ref name=FL>{{cite web |url= http://johnshadegg.house.gov/rsc/Federal%20Land%20Ownership--May%202005.pdf |title=Federal Land and Buildings Ownership |publisher=Republican Study Committee |date=May 19, 2005 |accessdate=March 9, 2009}}</ref> Most of this is [[protected area|protected]], though some is leased for oil and gas drilling, mining, logging, or cattle ranching; 2.4% is used for military purposes.<ref name=FL/>

==Political divisions==
{{Main|U.S. state}}
{{Further|Territorial evolution of the United States|United States territorial acquisitions}}
The United States is a [[federation|federal union]] of fifty states. The original thirteen states were the successors of the [[Thirteen Colonies|thirteen colonies]] that rebelled against British rule. Early in the country's history, three new states were organized on territory separated from the claims of the existing states: [[Kentucky]] from [[Virginia]]; [[Tennessee]] from [[North Carolina]]; and [[Maine]] from [[Massachusetts]]. Most of the other states have been carved from territories obtained through war or purchase by the U.S. government. One set of exceptions comprises [[Vermont]], [[Texas]], and [[Hawaii]]: each was an independent republic before joining the union. During the [[American Civil War]], [[West Virginia]] broke away from Virginia. The most recent state—Hawaii—achieved statehood on August 21, 1959.<ref>{{cite news |url= http://archives.starbulletin.com/1999/10/18/special/story4.html |title='The Goal Was Democracy for All |work= Honolulu Star-Bulletin |author=Borreca, Richard |date=October 18, 1999 |accessdate=February 11, 2012}}</ref> The states [[Texas v. White|do not have the right]] to [[secession|secede]] from the union.

The states compose the vast bulk of the U.S. land mass; the two other areas considered integral parts of the country are the District of Columbia, the [[federal district]] where the capital, Washington, is located; and [[Palmyra Atoll]], an uninhabited but [[territories of the United States|incorporated territory]] in the Pacific Ocean. The United States also possesses five major overseas territories: [[Puerto Rico]] and the [[United States Virgin Islands]] in the Caribbean; and [[American Samoa]], [[Guam]], and the [[Northern Mariana Islands]] in the Pacific.<ref>See 8 U.S.C. § 1101(a)(36) and 8 U.S.C. § 1101(a)(38) U.S. Federal Code, Immigration and Nationality Act. {{USC|8|1101a}}</ref> Those born in the major territories (except for American Samoa) possess [[Birthright citizenship in the United States|U.S. citizenship]].<ref>{{cite web| url = http://www.senate.gov/reference/resources/pdf/RL30527.pdf| title = Presidential Elections in the United States: A Primer (Page 7)| accessdate = January 18, 2010| date = April 17, 2000| publisher = United States Congressional Research Service}}</ref> American citizens residing in the territories have many of the same rights and responsibilities as citizens residing in the states; however, they are generally exempt from federal income tax, may not vote for president, and have only [[Delegate (United States Congress)|nonvoting representation in the U.S. Congress]].<ref>Raskin, James B. (2003). ''Overruling Democracy: The Supreme Court Vs. the American People''. London and New York: Routledge, pp. 36–38. ISBN 0-415-93439-7.</ref>

{{USA midsize imagemap with state names}}

===Income and human development===

{{Main|Income in the United States}}
{{See also|Income inequality in the United States|Poverty in the United States|Affluence in the United States}}

According to the [[United States Census Bureau]], the pretax [[median household income]] in 2010 was $49,445. The median ranged from $64,308 among Asian American households to $32,068 among African American households.<ref name=CBPR10/> Using purchasing power parity exchange rates, the overall median is similar to the most affluent cluster of [[Household income in the United States#International comparison|developed nations]]. After declining sharply during the middle of the 20th century, poverty rates have plateaued since the early 1970s, with 11–15% of Americans below the poverty line every year, and 58.5% spending at least one year in poverty between the ages of 25 and 75.<ref name="USCB IP&HIC 2007">{{cite web|author=DeNavas-Walt, Carmen, Bernadette D. Proctor, and Jessica Smith|url=http://www.census.gov/prod/2008pubs/p60-235.pdf|format=PDF|title=Income, Poverty, and Health Insurance Coverage in the United States: 2007|publisher=U.S. Census Bureau|month=August|year=2008|accessdate=2008-11-13}}</ref><ref>{{Cite book|last=Hacker|first=Jacob S.|year=2006|title=The Great Risk Shift: The New Economic Insecurity and the Decline of the American Dream|location=New York|publisher=Oxford University Press|isbn=0-19-533534-1}}</ref> In 2010, 46.2 million Americans lived in poverty, a figure that rose for the fourth year in a row.<ref name=CBPR10/>

[[File:South San Jose (crop).jpg|thumb|A middle-class suburban development in [[San Jose, California]], part of the [[San Francisco Bay Area]].]]The U.S. [[welfare state]] is one of the least extensive in the developed world, reducing both [[Economic inequality|relative poverty]] and [[poverty threshold|absolute poverty]] by considerably less than the mean for rich nations,<ref name="Sme">{{cite journal | last1 = Smeeding | first1 = T. M. | year = 2005 | title = Public Policy: Economic Inequality and Poverty: The United States in Comparative Perspective| journal = Social Science Quarterly | volume = 86| pages = 955–983 | doi = 10.1111/j.0038-4941.2005.00331.x }}</ref><ref>{{cite journal | last1 = Kenworthy | first1 = L. | year = 1999 | title = Do Social-Welfare Policies Reduce Poverty? A Cross-National Assessment" ''Social Forces'' 77(3), 1119–1139. Bradley, D., E. Huber, S. Moller, F. Nielsen, and J. D. Stephens (2003). "Determinants of Relative Poverty in Advanced Capitalist Democracies| journal = American Sociological Review | volume = 68 | issue = 1| pages = 22–51 }}</ref> though combined private and public social expenditures per capita are relatively high.<ref>{{cite journal|last=Fishback|first=Price V.|date=May 2010|title=Social Welfare Expenditures in the United States and the Nordic Countries: 1900–2003|journal=NBER Working Paper series|volume=15982|url=http://papers.nber.org/papers/w15982}}</ref> While the American welfare state effectively reduces poverty among the elderly,<ref>Orr, D. (November–December, 2004). "Social Security Isn't Broken: So Why the Rush to 'Fix' It?" In C. Sturr and R. Vasudevan, eds. (2007). ''Current Economic Issues''. Boston: Economic Affairs Bureau.</ref> it provides relatively little assistance to the young.<ref>{{cite web|url=http://www.prospect.org/cs/articles?article=a_new_deal_of_their_own|author=Starr, Paul|date=2008-02-25|title=A New Deal of Their Own|work=American Prospect|accessdate=2008-07-24}}</ref> A 2007 [[UNICEF]] study of children's well-being in twenty-one industrialized nations ranked the United States next to last.<ref>{{cite news|url=http://news.bbc.co.uk/nol/shared/bsp/hi/pdfs/13_02_07_nn_unicef.pdf|title=Child Poverty in Perspective: An Overview of Child Well-Being in Rich Countries|author=UNICEF|work=BBC|year=2007|accessdate=2007-09-10}}</ref>

Between 1947 and 1979, [[real income|real median income]] rose by over 80% for all classes, with the incomes of poor Americans rising faster than those of the rich.<ref name=Hartman>{{cite web|url=http://www.demos.org/inequality/numbers.cfm#1|author=Hartman, Chris|year=2008|title=By the Numbers: Income|publisher=Demos|accessdate=2008-07-24|archiveurl=http://web.archive.org/web/20110725230318/http://www.demos.org/inequality/numbers.cfm|archivedate=2011-07-25}}</ref> However, income gains since then have been slower, less widely shared, and accompanied by increased economic insecurity.<ref name=Hartman/><ref>Bartels, L. M. (2008). ''Unequal Democracy: The Political Economy of the New Gilded Age''. Princeton, NJ: Princeton University Press, p. 20.</ref> Median household income has increased for all classes since 1980,<ref>{{cite web|author=Henderson, David R.|url=http://www.hoover.org/publications/digest/3522596.html|title=The Rich—and Poor—Are Getting Richer|work=Hoover Digest|year=1998|accessdate=2007-06-19}}</ref> largely owing to more dual-earner households, the closing of the [[gender pay gap]], and longer work hours, but the growth has been strongly tilted toward the very top.<ref name="Sme"/><ref name=Hartman/><ref>{{cite web|url=http://www.frbsf.org/news/speeches/2006/1106.html|author=Yellen, J.|year=2006|title=Speech to the Center for the Study of Democracy 2006–2007 Economics of Governance Lecture University of California, Irvine|publisher=Federal Reserve Board|location=San Francisco|accessdate=2008-07-24}}{{cite web|author=Shapiro, Isaac|url=http://www.cbpp.org/cms/?fa=view&id=746|title=New IRS Data Show Income Inequality Is Again on the Rise|date=2005-10-17|publisher=Center on Budget and Policy Priorities|accessdate=2007-05-16}}</ref> Consequently, the share of income of the top 1%—21.8% of total reported income in 2005—has more than doubled since 1980,<ref>{{cite news|url=http://www.nytimes.com/2007/03/29/business/29tax.html?ex=1332820800&en=fb472e72466c34c8&ei=5088&partner=rssnyt&emc=rss|title=Income Gap Is Widening, Data Shows|author=Johnston, David Cay|work=New York Times|date=2007-03-29|accessdate=2007-05-16}}</ref> leaving the United States with the greatest income inequality among developed nations.<ref name="Sme"/><ref>{{cite web|url=http://elsa.berkeley.edu/~saez/TabFig2005prel.xls|author=Saez, E.|title=Table A1: Top Fractiles Income Shares (Excluding Capital Gains) in the U.S., 1913–2005|publisher=UC Berkeley|month=October|year=2007|accessdate=2008-07-24}}{{cite web|url=https://www.cia.gov/library/publications/the-world-factbook/fields/2172.html|title=Field Listing—Distribution of Family Income—Gini Index|publisher=CIA|work=The World Factbook|date=2007-06-14|accessdate=2007-06-17}}</ref> The United States has a [[progressive tax|progressive tax system]] which equates to higher income earners paying a larger percentage of their income in taxes.<ref>{{cite web | url=http://www.taxfoundation.org/blog/show/27134.html | title=No Country Leans on Upper-Income Households as Much as U.S | publisher=The Tax Foundation | date=March 21, 2011 | accessdate=March 15, 2012 | author=Hodge, Scott}}</ref> The top 1% pays 27.6% of all federal taxes, while the top 10% pays 54.7%.<ref>{{cite web|url=http://www.cbo.gov/ftpdocs/88xx/doc8885/EffectiveTaxRates.shtml|title=Shares of Federal Tax Liabilities, 2004 and 2005|publisher=Congressional Budget Office|accessdate=2008-11-02}}</ref> Wealth, like income and taxes, is highly concentrated: The richest 10% of the adult population possesses 69.8% of the country's household wealth, the second-highest share among developed nations.<ref>{{cite web|author=Domhoff, G. William|url=http://sociology.ucsc.edu/whorulesamerica/power/wealth.html|title=Table 4: Percentage of Wealth Held by the Top 10% of the Adult Population in Various Western Countries|publisher=University of California at Santa Cruz, Sociology Dept.|work=Power in America|month=December|year=2006|accessdate=2006-08-21}}</ref> The top 1% possesses 33.4% of net wealth.<ref>{{cite web|author=Kennickell, Arthur B.|url=http://www.federalreserve.gov/pubs/oss/oss2/papers/concentration.2004.5.pdf|title=Table11a: Amounts (Billions of 2004 Dollars) and Shares of Net Worth and Components Distributed by Net Worth Groups, 2004|publisher=Federal Reserve Board|work=Currents and Undercurrents: Changes in the Distribution of Wealth, 1989–2004|date=2006-08-02|accessdate=2007-06-24}}</ref> In 2011 the [[United Nations Development Programme]] ranked the United States 23rd among 139 countries on its [[List of countries by inequality-adjusted HDI|inequality-adjusted human development index]] (IHDI), nineteen places lower than in the standard [[Human Development Index|HDI]].<ref>{{cite web|url=http://hdr.undp.org/en/media/HDR_2011_EN_Complete.pdf |title=2011 Human Development Report |publisher=United Nations Development Programme |accessdate=2012-06-01}}</ref>

==Infrastructure==

===Science and technology===
[[File:Aldrin Apollo 11.jpg|thumb|left|upright|A photograph from [[Apollo 11]] of [[Buzz Aldrin]] on the surface of the Moon]]
{{Main|Science and technology in the United States}}
{{See also|Technological and industrial history of the United States}}
The United States has been a leader in scientific research and technological innovation since the late 19th century. In 1876, [[Alexander Graham Bell]] was awarded the first U.S. [[Invention of the telephone|patent for the telephone]]. [[Thomas Edison]]'s laboratory developed the [[phonograph]], the first [[Incandescent light bulb|long-lasting light bulb]], and the first viable [[Kinetoscope|movie camera]]. [[Nikola Tesla]] pioneered [[alternating current]], the [[AC motor]], and radio. In the early 20th century, the automobile companies of [[Ransom E. Olds]] and [[Henry Ford]] popularized the [[assembly line]]. The [[Wright brothers]], in 1903, made the [[Wright Flyer|first sustained and controlled heavier-than-air powered flight]].<ref>{{cite web|author=Benedetti, François| url =http://www.fai.org/news_archives/fai/000295.asp| archiveurl =http://web.archive.org/web/20070912065254/http://www.fai.org/news_archives/fai/000295.asp| archivedate =2007-09-12| title =100 Years Ago, the Dream of Icarus Became Reality| publisher =Fédération Aéronautique Internationale (FAI)|date=2003-12-17|accessdate=2007-08-15}}</ref>

The rise of [[Nazism]] in the 1930s led many European scientists, including [[Albert Einstein]], [[Enrico Fermi]], and [[John von Neumann]], to immigrate to the United States. During World War II, the [[Manhattan Project]] developed nuclear weapons, ushering in the [[Atomic Age]]. The [[Space Race]] produced rapid advances in rocketry, [[materials science]], and computers. [[IBM]], [[Apple Inc.|Apple Computer]], and [[Microsoft]] refined and popularized the [[personal computer]]. The United States largely developed the [[ARPANET]] and its successor, the [[Internet]]. Today, 64% of research and development funding comes from the private sector.<ref>{{cite web | url = https://www.census.gov/compendia/statab/2008/tables/08s0775.xls | title = Research and Development (R&D) Expenditures by Source and Objective: 1970 to 2004 | publisher = U.S. Census Bureau | accessdate = 2007-06-19 }}</ref> The United States leads the world in scientific research papers and [[impact factor]].<ref>{{cite news | url = http://www.guardian.co.uk/education/2006/mar/21/highereducation.uk4 |author=MacLeod, Donald| title = Britain Second in World Research Rankings | date=2006-03-21 | work = Guardian | accessdate = 2006-05-14 | location=London}}</ref> As of April 2010, 68% of American households had broadband Internet service.<ref>{{cite web | url =http://www.esa.doc.gov/Reports/exploring-digital-nation-computer-and-internet-use-home| title =Exploring the Digital Nation—Computer and Internet Use at Home | publisher =U.S. Dept. of Commerce, Economics and Statistics Administration|date=2011-11-08| accessdate = 2012-04-11 }}</ref> The country is the primary developer and grower of [[genetically modified food]], representing half of the world's biotech crops.<ref>{{cite web | url = http://www.isaaa.org/resources/publications/briefs/39/download/isaaa-brief-39-2008.pdf | title = ISAAA Brief 39-2008: Executive Summary—Global Status of Commercialized Biotech/GM Crops: 2008 | publisher = International Service for the Acquisition of Agri-Biotech Applications |page=15| accessdate = 2010-07-16 }}</ref>

===Transportation===
[[File:Map of current Interstates.svg|thumb|The [[Interstate Highway System]], which extends {{convert|46876|mi|km}}<ref>{{cite web |title=Interstate FAQ (Question #3) |publisher=Federal Highway Administration |year=2006 |url=http://www.fhwa.dot.gov/interstate/faq.htm#question3 |accessdate=2009-03-04}}</ref>]]
{{Main|Transportation in the United States}}
Personal transportation is dominated by automobiles, which operate on a network of 13 million roads,<ref>{{cite web|url =http://en.wikipedia.org/wiki/Wikispeedia| title =Number of Highways|publisher =WikiSPEEDia, derived from U.S. Census Bureau| accessdate = 2010-06-10}}</ref> including one of the world's [[National Highway System (United States)|longest highway systems]].<ref>{{cite web |url=http://www.newgeography.com/content/002003-china-expressway-system-exceed-us-interstates |title=China Expressway System to Exceed US Interstates |publisher=Newgeography.com |date=2011-01-22 |accessdate=2011-09-16}}</ref> The world's second largest automobile market,<ref>{{cite news|url=http://www.guardian.co.uk/business/2010/jan/08/china-us-car-sales-overtakes |title=China overtakes US in car sales|publisher=Guardian |date= 2010-01-08|accessdate=2011-07-10 |location=London}}</ref> the United States has the highest rate of per-capita vehicle ownership in the world, with 765 vehicles per 1,000 Americans.<ref>{{cite web|url=http://www.nationmaster.com/graph/tra_mot_veh-transportation-motor-vehicles |title=Motor vehicles statistics&nbsp;– countries compared worldwide |publisher=NationMaster |date= |accessdate=2011-07-10}}</ref> About 40% of [[Passenger vehicles in the United States|personal vehicles]] are vans, [[Sport utility vehicle|SUVs]], or light trucks.<ref>{{cite web|url =http://www.bts.gov/publications/highlights_of_the_2001_national_household_travel_survey/html/section_01.html| title =Household, Individual, and Vehicle Characteristics|publisher =U.S. Dept. of Transportation, Bureau of Transportation Statistics|work =2001 National Household Travel Survey|accessdate = 2007-08-15}}</ref> The average American adult (accounting for all drivers and nondrivers) spends 55 minutes driving every day, traveling {{convert|29|mi|km|0}}.<ref>{{cite web|url =http://www.bts.gov/publications/highlights_of_the_2001_national_household_travel_survey/html/section_02.html| title =Daily Passenger Travel|publisher =U.S. Dept. of Transportation, Bureau of Transportation Statistics|work =2001 National Household Travel Survey|accessdate = 2007-08-15}}</ref>

[[Mass transit in the United States|Mass transit]] accounts for 9% of total U.S. work trips,<ref>{{cite web | url = http://www.policy.rutgers.edu/vtc/documents/TOD.Euro-Style_Planning-Renne-Wells.pdf |format=PDF|author=Renne, John L., and Jan S. Wells| title = Emerging European-Style Planning in the United States: Transit-Oriented Development (p. 2) | year=2003 | publisher = Rutgers, The State University of New Jersey | accessdate = 2007-06-11}}</ref> ranking last in a survey of 17 countries.<ref>{{cite web|url=http://switchboard.nrdc.org/blogs/kbenfield/natgeo_surveys_countries_trans.html |title=NatGeo surveys countries' transit use: guess who comes in last|publisher=Switchboard.nrdc.org |date=2009-05-18 |accessdate=2011-07-10}}</ref> While [[Rail transportation in the United States|transport of goods by rail]] is extensive, relatively few people use rail to travel,<ref>{{cite web | url = http://www.gao.gov/products/GAO-07-15 | title = Intercity Passenger Rail: National Policy and Strategies Needed to Maximize Public Benefits from Federal Expenditures| date=2006-11-13| publisher = U.S. Government Accountability Office| accessdate = 2007-06-20 }}</ref> though ridership on [[Amtrak]], the national intercity passenger rail system, grew by almost 37% between 2000 and 2010.<ref>{{cite web|title=Amtrak Ridership Records|url=http://www.amtrak.com/servlet/BlobServer?blobcol=urldata&blobtable=MungoBlobs&blobkey=id&blobwhere=1249227805921&blobheader=application%2Fpdf&blobhead|publisher=Amtrak|date=2011-06-08|accessdate=2012-02-29}}</ref> [[Light rail in the United States|Light rail development]] has increased in recent years but, like [[High-speed rail in the United States|high speed rail]], is below European levels.<ref>{{cite web|url=http://www.metaefficient.com/trains/master-2.html |title=3 Reasons Light Rail Is an Efficient Transportation Option for U.S. Cities|author=McGill, Tracy|publisher=MetaEfficient|date=2011-01-01 |accessdate=2011-08-29}}</ref> Bicycle usage for work commutes is minimal.<ref>{{cite web|url=http://trafficsafety.org/safety/sharing/bike/bike-facts/bicycling-to-work |title=Bicycling to Work|publisher=Trafficsafety.org |date= |accessdate=2011-07-10}}</ref>

The civil airline industry is entirely privately owned and has been largely [[Airline Deregulation Act|deregulated since 1978]], while most major airports are publicly owned. The three largest airlines in the world by passengers carried are U.S.-based; [[Delta Air Lines]] is number one.<ref>{{cite web|url=http://www.iata.org/ps/publications/Pages/wats-passenger-carried.aspx| title =Scheduled Passengers Carried|publisher=International Air Transport Association (IATA)|year=2011|accessdate=2012-02-17}}</ref> Of the world's thirty busiest passenger airports, sixteen are in the United States, including the busiest, [[Hartsfield-Jackson Atlanta International Airport]].<ref>{{cite web|url=http://www.airports.org/cda/aci_common/display/main/aci_content07_c.jsp?zn=aci&cp=1-5-54-55_666_2__|title=Passenger Traffic 2006 Final|publisher=Airports Council International|date=2007-07-18|accessdate=2007-08-15}}</ref>

===Energy===
{{See also|Energy policy of the United States}}

The [[Energy in the United States|United States energy]] market is 29,000 [[Watt-hour|terawatt hours]] per year. [[List of countries by energy consumption per capita|Energy consumption per capita]] is 7.8&nbsp;tons of oil equivalent per year, the 10th highest rate in the world. In 2005, 40% of this energy came from petroleum, 23% from coal, and 22% from natural gas. The remainder was supplied by nuclear power and [[renewable energy]] sources.<ref>{{cite web |url= http://www.eia.doe.gov/emeu/aer/pdf/pages/sec1_3.pdf |title= Diagram 1: Energy Flow, 2007 |work=EIA Annual Energy Review 2007 |publisher=U.S. Dept. of Energy, Energy Information Administration |accessdate=June 25, 2008}}</ref> The United States is the world's largest consumer of petroleum.<ref>{{cite web |url= https://www.cia.gov/library/publications/the-world-factbook/rankorder/2174rank.html |title= Rank Order—Oil (Consumption) |publisher=CIA |work=The World Factbook |date=September 6, 2007 |accessdate=September 14, 2007}}</ref> For decades, [[Nuclear power in the United States|nuclear power]] has played a limited role relative to many other developed countries, in part due to public perception in the wake of a [[Three Mile Island accident|1979 accident]]. In 2007, several applications for new nuclear plants were filed.<ref>{{cite news |url= http://www.economist.com/science/displaystory.cfm?story_id=9762843 |title= Atomic Renaissance |work=The Economist |location =London |accessdate=September 6, 2007 |date=September 6, 2007}}</ref> The United States has 27% of global coal reserves.<ref name="BPReview">{{cite web |url= http://www.bp.com/liveassets/bp_internet/globalbp/globalbp_uk_english/reports_and_publications/statistical_energy_review_2007/STAGING/local_assets/downloads/spreadsheets/statistical_review_full_report_workbook_2007.xls |title= BP Statistical Review of World Energy |publisher= British Petroleum |format= XLS |month=June | year=2007 | accessdate = February 22, 2010}}</ref>

===Education===
[[File:University-of-Virginia-Rotunda.jpg|thumb|Some 80% of U.S. college students attend [[public university|public universities]] such as the [[University of Virginia]], founded by [[Thomas Jefferson]].<ref>{{cite web |title=Public Education for the Common Good |author=Rosenstone, Steven J. |publisher=University of Minnesota |url=http://cla.umn.edu/news/clatoday/summer2002/dean.php |date=2009-12-17 |accessdate=2009-03-06}}</ref>]]
{{Main|Education in the United States}}
{{See also|Educational attainment in the United States|Higher education in the United States}}

American [[public education]] is operated by state and local governments, regulated by the [[United States Department of Education]] through restrictions on federal grants. Children are required in most states to attend school from the age of six or seven (generally, [[kindergarten]] or [[first grade]]) until they turn eighteen (generally bringing them through [[twelfth grade]], the end of [[high school]]); some states allow students to leave school at sixteen or seventeen.<ref>{{cite web |url=http://nces.ed.gov/programs/digest/d02/dt150.asp |title=Ages for Compulsory School Attendance... |accessdate = 2007-06-10 |publisher=U.S. Dept. of Education, National Center for Education Statistics}}</ref> About 12% of children are enrolled in [[parochial school|parochial]] or [[nonsectarian]] [[private school]]s. Just over 2% of children are [[homeschooling|homeschooled]].<ref>{{cite web |url=http://www2.ed.gov/about/offices/list/oii/nonpublic/statistics.html |title=Statistics About Non-Public Education in the United States |accessdate = 2007-06-05 |publisher=U.S. Dept. of Education, Office of Non-Public Education}}</ref>

The United States has many competitive private and public [[List of American institutions of higher education|institutions of higher education]]. According to prominent international rankings, 13 or 15 American colleges and universities are ranked among the top 20 in the world.<ref>{{cite web|url=http://www.topuniversities.com/university-rankings/world-university-rankings/2010 |title=QS World University Rankings |publisher=Topuniversities |date= |accessdate=2011-07-10}}</ref><ref>{{cite web|url=http://www.timeshighereducation.co.uk/world-university-rankings/2010-2011/top-200.html |title=Top 200&nbsp;– The Times Higher Education World University Rankings 2010–2011 |publisher=Timeshighereducation.co.uk |date= |accessdate=2011-07-10}}</ref> There are also local [[community college]]s with generally more open admission policies, shorter academic programs, and lower tuition. Of Americans twenty-five and older, 84.6% graduated from high school, 52.6% attended some college, 27.2% earned a [[bachelor's degree]], and 9.6% earned graduate degrees.<ref>{{cite web|url=http://www.census.gov/prod/2004pubs/p20-550.pdf|title=Educational Attainment in the United States: 2003|publisher=U.S. Census Bureau|accessdate = 2006-08-01}}</ref> The basic [[literacy|literacy rate]] is approximately 99%.<ref name="WF" /><ref>For more detail on U.S. literacy, see [http://nces.ed.gov/NAAL/PDF/2006470.PDF A First Look at the Literacy of America’s Adults in the 21st century], U.S. Department of Education (2003).</ref> The United Nations assigns the United States an Education Index of 0.97, tying it for 12th in the world.<ref>{{cite web|title=Human Development Indicators|year=2005|publisher=United Nations Development Programme, Human Development Reports|accessdate = 2008-01-14|url=http://hdr.undp.org/reports/global/2005/pdf/HDR05_HDI.pdf|archiveurl=http://web.archive.org/web/20070620235428/http://hdr.undp.org/reports/global/2005/pdf/HDR05_HDI.pdf|archivedate=2007-06-20}}</ref>

===Health===
{{See also|Health care in the United States|Health care reform in the United States|Health insurance in the United States}}
[[File:Aerial view of Texas Medical Center.jpg|thumb|The [[Texas Medical Center]] in [[Houston]], the world's largest medical center<ref>{{cite web |url=http://www.texmedctr.tmc.edu/root/en/GetToKnow/FactsandFigures/Facts+and+Figures.htm|title=2007 Facts & Figures|accessdate = 2008-11-07|publisher=Texas Medical Center}}</ref>]]
The United States life expectancy of 78.4 years at birth ranks it 50th among 221 nations.<ref>{{cite web|url=https://www.cia.gov/library/publications/the-world-factbook/rankorder/2102rank.html|title=Country Comparison: Life Expectancy at Birth|publisher=CIA|work=The World Factbook|accessdate=2011-10-25}}</ref> Increasing obesity in the United States and health improvements elsewhere have contributed to lowering the country's rank in life expectancy from 1987, when it was 11th in the world.<ref>{{cite news|author=MacAskill, Ewen|url=http://www.guardian.co.uk/world/2007/aug/13/usa.ewenmacaskill |title=US Tumbles Down the World Ratings List for Life Expectancy|date=2007-08-13 |work= Guardian|accessdate = 2007-08-15|location=London}}</ref> Approximately [[Obesity in the United States|one-third of the adult population is obese]] and an additional third is overweight;<ref>{{cite web |url=http://www.cdc.gov/nchs/products/pubs/pubd/hestats/overweight/overwght_adult_03.htm |title=Prevalence of Overweight and Obesity Among Adults: United States, 2003–2004 |accessdate = 2007-06-05 |publisher=Centers for Disease Control and Prevention, National Center for Health Statistics}}</ref> the obesity rate, the highest in the industrialized world, has more than doubled in the last quarter-century.<ref>{{cite book | author= Schlosser, Eric | year = 2002 | title = Fast Food Nation | publisher = Perennial | location = New York| isbn = 0-06-093845-5 |page = 240 }}</ref> Obesity-related [[diabetes mellitus type 2|type 2 diabetes]] is considered epidemic by health care professionals.<ref>{{cite web |url=http://atvb.ahajournals.org/cgi/content/full/25/12/2451#R3-101329 |title=Fast Food, Central Nervous System Insulin Resistance, and Obesity|year=2005 |accessdate = 2007-06-17|work= [[Arteriosclerosis, Thrombosis, and Vascular Biology]]|publisher=American Heart Association}}</ref> The infant mortality rate of 6.06 per thousand places the United States 176th out of 222 countries.<ref>{{cite web |url=https://www.cia.gov/library/publications/the-world-factbook/rankorder/2091rank.html|title=Country Comparison: Infant Mortality Rate|publisher =CIA|work=The World Factbook|accessdate = 2011-10-25}}</ref>

The U.S. health care system far [[List of countries by total health expenditure (PPP) per capita|outspends]] any other nation's, measured in both per capita spending and percentage of GDP.<ref>''OECD Health Data 2000: A Comparative Analysis of 29 Countries'' [CD-ROM] (OECD: Paris, 2000). See also {{cite web |url=http://classic-web.archive.org/web/20061118234952/http://dll.umaine.edu/ble/U.S.+HCweb.pdf|title=The U.S. Healthcare System: The Best in the World or Just the Most Expensive?|year=2001|accessdate = 2006-11-29 |publisher=University of Maine}}</ref>
Health care coverage in the United States is a combination of public and private efforts, and is not [[universal health care|universal]] as in all other developed countries. In 2004, private insurance paid for 36% of personal health expenditures, private out-of-pocket payments covered 15%, and federal, state, and local governments paid for 44%.<ref name="CDC H">{{cite web |url=http://www.cdc.gov/nchs/data/hus/hus06.pdf|title=Health, United States, 2006|accessdate = 2006-11-24 |publisher=Centers for Disease Control, National Center for Health Statistics}}</ref> In 2005, 46.6 million Americans, 15.9% of the population, were uninsured, 5.4 million more than in 2001. The main cause of this rise is the drop in the number of Americans with employer-sponsored health insurance.<ref name="CBPP">{{cite web|url=http://www.cbpp.org/cms/?fa=view&id=629|title=Poverty Remains Higher, and Median Income for Non-Elderly Is Lower, Than When Recession Hit Bottom: Poor Performance Unprecedented for Four-Year Recovery Period|publisher=Center for Budget and Policy Priorities|date =2006-09-01|accessdate = 2007-06-24}}</ref> The subject of uninsured and underinsured Americans is a major political issue.<ref>{{cite news|author=Abelson, Reed|url=http://www.nytimes.com/2008/06/10/health/policy/10health.html|title=Ranks of Underinsured Are Rising, Study Finds|date= 2008-06-10|work=New York Times|accessdate=2008-10-25}} {{cite journal|author=Blewett, Lynn A. et al.|title=How Much Health Insurance Is Enough? Revisiting the Concept of Underinsurance|year= 2006|work=Medical Care Research and Review|volume=63|issue=6|pages=663–700|doi=10.1177/1077558706293634|journal=Medical Care Research and Review|pmid=17099121|month=Dec|first1=LA|first2=A|first3=TJ|issn=1077-5587}}</ref> In 2006, [[Massachusetts]] became the first state to mandate universal health insurance.<ref>{{cite news|author=Fahrenthold, David A.|url=http://www.washingtonpost.com/wp-dyn/content/article/2006/04/04/AR2006040401937.html|title= Mass. Bill Requires Health Coverage|date= 2006-04-05|work=Washington Post|accessdate=2007-06-19}}</ref> [[Patient Protection and Affordable Care Act|Federal legislation]] passed in early 2010 will create a near-universal health insurance system around the country by 2014.

==Crime and law enforcement==
{{Main|Law enforcement in the United States|Crime in the United States}}
{{See also|Law of the United States|Incarceration in the United States|Capital punishment in the United States}}
[[File:Ford Crown Victoria 1.JPG|thumb|Law enforcement in the U.S. is maintained primarily by local police departments. The [[New York City Police Department]] (NYPD) is the largest in the country.<ref>{{cite web |url=http://bjs.ojp.usdoj.gov/content/pub/pdf/lpd03.pdf|title=Local Police Departments, 2003 |publisher=U.S. Dept. of Justice, Bureau of Justice Statistics|date = May 2006|accessdate=2011-12-07}}</ref>]]
Law enforcement in the United States is primarily the responsibility of local police and [[sheriff]]'s departments, with [[state police]] providing broader services. Federal agencies such as the [[Federal Bureau of Investigation]] (FBI) and the [[United States Marshals Service|U.S. Marshals Service]] have specialized duties. At the federal level and in almost every state, jurisprudence operates on a [[common law]] system. State courts conduct most criminal trials; [[United States federal courts|federal courts]] handle certain designated crimes as well as certain appeals from the state systems. [[Controlled Substances Act|Federal law]] prohibits a variety of drugs, although states sometimes [[Legal history of cannabis in the United States#Attempts to decriminalize (1970s–2000s)|pass laws]] in conflict with federal regulations. The [[Smoking age#United States|smoking age]] is generally 18, and the [[Legal drinking age#Americas|drinking age]] is generally 21.

Among developed nations, the United States has above-average levels of violent crime and particularly high levels of [[Gun violence in the United States|gun violence]] and homicide.<ref>{{cite web |url=http://www.unodc.org/pdf/crime/eighthsurvey/8sv.pdf|title=Eighth United Nations Survey of Crime Trends and Operations of Criminal Justice Systems (2001–2002) |publisher=United Nations Office on Drugs and Crime (UNODC) |date = 2005-03-31|accessdate=2008-05-18}}</ref> There were 5.0 murders per 100,000 persons in 2009, 10.4% fewer than in 2000.<ref>{{cite web|url=http://www2.fbi.gov/ucr/cius2009/offenses/violent_crime/murder_homicide.html|title=Murder|work=Crime in the United States 2009|publisher=FBI|month=September | year=2010|accessdate=2011-07-23}}{{dead link|date=June 2012}}</ref> [[Second Amendment to the United States Constitution|Gun ownership rights]] are the subject of [[Gun politics in the United States|contentious political debate]].

The United States has the highest documented incarceration rate<ref name="SP">{{cite web |url=http://www.sentencingproject.org/doc/publications/inc_newfigures.pdf|title=New Incarceration Figures: Thirty-Three Consecutive Years of Growth |month=December | year=2006 |accessdate = 2007-06-10 |publisher=Sentencing Project}}</ref> and total prison population<ref>{{cite web| author=Walmsley, Roy |url=http://www.kcl.ac.uk/depsta/rel/icps/world-prison-population-list-2005.pdf |archiveurl=http://web.archive.org/web/20070628215935/http://www.kcl.ac.uk/depsta/rel/icps/world-prison-population-list-2005.pdf |archivedate=2007-06-28|title=World Prison Population List |year=2005|accessdate = 2007-10-19|publisher=King's College London, International Centre for Prison Studies}} For the latest data, see {{cite web|url=http://www.kcl.ac.uk/depsta/rel/icps/worldbrief/north_america_records.php?code=190|archiveurl=http://web.archive.org/web/20070804061423/http://www.kcl.ac.uk/depsta/rel/icps/worldbrief/north_america_records.php?code=190|archivedate=2007-08-04|title=Prison Brief for United States of America|date=2006-06-21|accessdate = 2007-10-19|publisher=King's College London, International Centre for Prison Studies}} For other estimates of the incarceration rate in China and North Korea see {{cite web|author=Adams, Cecil|url=http://www.straightdope.com/columns/read/2494/does-the-united-states-lead-the-world-in-prison-population |title=Does the United States Lead the World in Prison Population? |date=2004-02-06|accessdate = 2007-10-11 |publisher=The Straight Dope}}</ref> in the world. At the start of 2008, more than 2.3 million people were incarcerated, more than one in every 100 adults.<ref>{{cite web |url=http://www.pewcenteronthestates.org/news_room_detail.aspx?id=35912 |title=Pew Report Finds More than One in 100 Adults are Behind Bars |date=2008-02-28 |accessdate = 2008-03-02 |publisher=Pew Center on the States |archiveurl=http://web.archive.org/web/20080303025427/http://www.pewcenteronthestates.org/news_room_detail.aspx?id=35912 |archivedate=2008-03-03 |deadurl=yes}}</ref> The current rate is about seven times the 1980 figure,<ref>{{cite web |url=http://www.ojp.usdoj.gov/bjs/glance/tables/incrttab.htm |archiveurl=http://web.archive.org/web/20070611192107/http://www.ojp.usdoj.gov/bjs/glance/tables/incrttab.htm |archivedate=2007-06-11 |title=Incarceration Rate, 1980–2005 |year=2006|accessdate = 2007-06-10 |publisher=U.S. Dept. of Justice, Bureau of Justice Statistics}}</ref> and over three times the figure in Poland, the [[Organisation for Economic Co-operation and Development]] (OECD) country with the next highest rate.<ref>{{cite web|url=http://www.prisonstudies.org/info/downloads/wppl-8th_41.pdf|title=World Prison Population List (8th edition)|year=2009|accessdate = 2011-07-23|publisher=King's College London, International Centre for Prison Studies}}</ref> African American males are jailed at about six times the rate of white males and three times the rate of Hispanic males.<ref name="SP"/> The country's high rate of incarceration is largely due to [[United States Federal Sentencing Guidelines|sentencing]] and [[Drug policy of the United States|drug policies]].<ref name="SP"/><ref name="HRW">{{cite web |url=http://www.hrw.org/legacy/reports/2000/usa/Rcedrg00-05.htm |title=The Impact of the War on Drugs on U.S. Incarceration |month=May | year=2000 |accessdate = 2007-06-10 |publisher=Human Rights Watch}}</ref>

Capital punishment is sanctioned in the United States for certain federal and military crimes, and in thirty-four states. Since 1976, when the U.S. Supreme Court [[Gregg v. Georgia|reinstated the death penalty]] after a four-year moratorium, there have been more than 1,000 executions.<ref>{{cite web |url=http://www.deathpenaltyinfo.org/executions-united-states-2007 |title=Executions in the United States in 2007|accessdate = 2007-06-15 |publisher=Death Penalty Information Center}}</ref> In 2010, the country had the fifth highest number of executions in the world, following China, [[Iran]], [[North Korea]], and [[Yemen]].<ref>{{cite web |url=http://www.deathpenaltyinfo.org/death-penalty-international-perspective#interexec |title=Executions Around the World|accessdate = 2011-07-23|year=2010 |publisher=Death Penalty Information Center}}</ref> In 2007, [[New Jersey]] became the first state to legislatively abolish the death penalty since the 1976 Supreme Court decision, followed by [[New Mexico]] in 2009 and [[Illinois]] in 2011.<ref name="QuinnSignsAbolition">{{cite news|url=http://newsblogs.chicagotribune.com/clout_st/2011/03/quinn-signs-death-penalty-ban-commutes-15-death-row-sentences-to-life.html|title=Quinn Signs Death Penalty Ban, Commutes 15 Death Row Sentences to Life|date=2011-03-09|accessdate=2011-03-09|newspaper=[[Chicago Tribune]]}}</ref>

==Demographics==
{{Main|Demographics of the United States|Americans}}
[[File:Census-2000-Data-Top-US-Ancestries-by-County.svg|thumb|320px|Largest ancestry groups by county, 2000]]
{|class="infobox" style="font-size: 90%; border: 1px solid #999; float: right; margin-left: 1em; width: 240px;"
|- style="background:#f5f5f5;"
! colspan="2" | Race/Ethnicity (2010)<ref name="Cen2010Summary">{{cite web|url=http://2010.census.gov/2010census/data/|title=2010 Census Data| publisher = U.S. Census Bureau | accessdate = 2011-03-29}}</ref>
|-
| [[White American|White]] || style="text-align: center;" |72.4%
|-
| [[Black American|Black/African American]] || style="text-align: center;" |12.6%
|-
| [[Asian American|Asian]] || style="text-align: center;" |4.8%
|-
| [[Native Americans in the United States|American Indian]] and [[Alaska Natives|Alaska Native]] || style="text-align: center;" |0.9%
|-
| [[Native Hawaiians|Native Hawaiian]] and [[Pacific Islander American|Pacific Islander]] || style="text-align: center;" |0.2%
|-
| Other || style="text-align: center;" |6.2%
|-
| [[Multiracial American|Two or more races]] || style="text-align: center;" | 2.9%
|-
| [[Hispanic and Latino Americans|Hispanic/Latino]] (''of any race'') || style="text-align: center;" |16.3%
|}

The [[U.S. Census Bureau]] estimates the country's population now to be {{formatnum:{{data United States | Poptoday }} }},<ref name="POP" /> including an estimated 11.2 million [[Illegal immigration to the United States|illegal immigrants]].<ref>{{cite web | url = http://www.cis.org/articles/2008/back808.pdf| author =Camarota, Steven A., and Karen Jensenius | title = Homeward Bound: Recent Immigration Enforcement and the Decline in the Illegal Alien Population | month =July | year =2008| publisher = Center for Immigration Studies | accessdate = 2008-08-06}}</ref> The U.S. population almost quadrupled during the 20th century, from about 76 million in 1900.<ref>{{cite web|url=http://www.census.gov/prod/2005pubs/06statab/pop.pdf |format=PDF|title=Statistical Abstract of the United States |publisher=[[United States Census Bureau]]}}</ref> The third most populous nation in the world, after China and [[India]], the United States is the only major industrialized nation in which large population increases are projected.<ref name="PRC">{{cite web|url=http://www.prcdc.org/summaries/uspopperspec/uspopperspec.html|title=Executive Summary: A Population Perspective of the United States|publisher=Population Resource Center|month=May|year=2000|accessdate=2007-12-20|archiveurl=http://web.archive.org/web/20070604165856/http://www.prcdc.org/summaries/uspopperspec/uspopperspec.html|archivedate=2007-06-04}}</ref> Even with a birth rate of 13.82 per 1,000, 30% below the world average, its [[population growth]] rate is positive at 1%, significantly higher than those of many developed nations.<ref>{{cite web|url=https://www.cia.gov/library/publications/the-world-factbook/rankorder/2054rank.html|title=Rank Order—Birth Rate|publisher=CIA|work=The World Factbook|year=2009|accessdate=2009-10-11}}</ref> In fiscal year 2011, over 1 million [[Immigration to the United States|immigrants]] (most of whom entered through [[Chain migration#Legislation and chain migration|family reunification]]) were granted [[United States Permanent Resident Card|legal residence]].<ref name="LPR">[http://www.dhs.gov/xlibrary/assets/statistics/publications/lpr_fr_2011.pdf “U.S. Legal Permanent Residents: 2011”]. [[Office of Immigration Statistics]] ''Annual Flow Report.''</ref> Mexico has been the leading source of new residents for over two decades; since 1998, China, India, and the Philippines have been in the top four sending countries every year.<ref>{{cite web|url = http://www.dhs.gov/files/statistics/publications/LPR07.shtm|title=Persons Obtaining Legal Permanent Resident Status by Region and Country of Birth: Fiscal Years 1998 to 2007 (Table 3)|publisher=U.S. Dept. of Homeland Security|accessdate=2008-09-06}}</ref>

The United States has a very [[multiethnic society|diverse population]]—thirty-one [[maps of American ancestries|ancestry groups]] have more than one million members.<ref name="An2000">{{cite web|url=http://www.census.gov/prod/2004pubs/c2kbr-35.pdf|title=Ancestry 2000|publisher=U.S.Census Bureau|month=June|year=2004|accessdate=2007-06-13}}</ref> [[White American]]s are the largest [[race (classification of humans)|racial group]]; [[German American]]s, [[Irish American]]s, and [[English American]]s constitute three of the country's four largest ancestry groups.<ref name="An2000"/> [[African American]]s are the nation's largest [[minority group|racial minority]] and third largest ancestry group.<ref name="An2000"/> [[Asian American]]s are the country's second largest racial minority; the two largest Asian American ethnic groups are [[Chinese American]]s and [[Filipino American]]s.<ref name="An2000"/> In 2010, the U.S. population included an estimated 5.2 million people with some [[Native Americans in the United States|American Indian]] or [[Alaska Natives|Alaska Native]] ancestry (2.9 million exclusively of such ancestry) and 1.2 million with some [[Native Hawaiians|native Hawaiian]] or [[Pacific Islander|Pacific island]] ancestry (0.5 million exclusively).<ref name="Cen2010Race">{{cite web|author=Humes, Karen R., Nicholas A. Jones, and Roberto R. Ramirez|url=http://www.census.gov/prod/cen2010/briefs/c2010br-02.pdf|title=Overview of Race and Hispanic Origin: 2010| publisher = U.S. Census Bureau| date = March 2011| accessdate = 2011-03-29}}</ref> The census counted more than 19 million people of "Some Other Race" who were "unable to identify with any" of its five official race categories in 2010.<ref name="Cen2010Race"/>

The population growth of [[Hispanic and Latino Americans]] (the terms are officially interchangeable) is a major [[demographic transition|demographic trend]]. The 50.5 million Americans of Hispanic descent<ref name="Cen2010Race"/> are identified as sharing a distinct "[[Race and ethnicity in the United States Census|ethnicity]]" by the Census Bureau; 64% of Hispanic Americans are of [[Mexican American|Mexican descent]].<ref name=CB2007>{{cite web | url = http://factfinder.census.gov/servlet/DTTable?_bm=y&-ds_name=ACS_2007_1YR_G00_&-CONTEXT=dt&-mt_name=ACS_2007_1YR_G2000_B03001&-redoLog=true&-geo_id=01000US&-geo_id=04000US48&-format=&-_lang=en&-SubjectID=15233304 | title = B03001. Hispanic or Latino Origin by Specific Origin | work = 2007 American Community Survey | publisher = U.S. Census Bureau | accessdate = 2008-09-26}}</ref> Between 2000 and 2010, the country's Hispanic population increased 43% while the non-Hispanic population rose just 4.9%.<ref name="Cen2010Summary"/> Much of this growth is from immigration; as of 2007, 12.6% of the U.S. population was foreign-born, with 54% of that figure born in [[Latin America]].<ref>{{cite web|url=http://www.census.gov/prod/2008pubs/09statab/pop.pdf|publisher=U.S. Census Bureau|work=Statistical Abstract of the United States 2009| title=Tables 41 and 42—Native and Foreign-Born Populations|accessdate = 2009-10-11}}</ref> Fertility is also a factor; as of 2010 the average Hispanic woman gave birth to 2.4 children in her lifetime, compared to 2.0 for non-Hispanic black women and 1.8 for non-Hispanic white women (below the [[replacement rate]] of 2.1).<ref>{{cite web|author=Hamilton, Brady E., Joyce A. Martin, and Stephanie J. Ventura | url = http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_02.pdf | title = Births: Preliminary Data for 2010 | work = National Vital Statistics Reports, Volume 60, Number 2 | publisher = U.S. Dept. of Health and Human Services|date=2011-11-17 | accessdate = 2012-04-16}}</ref> [[Minority group|Minorities]] (as defined by the Census Bureau as all those beside non-Hispanic, non-multiracial whites) constituted 36.3% of the population in 2010,<ref>[http://2010.census.gov/news/releases/operations/cb11-cn123.html US Census Bureau: "U.S. Census Bureau Delivers Final State 2010 Census Population Totals for Legislative Redistricting"] see custom table, 2nd worksheet</ref> and nearly 50% of children under age 1,<ref>{{cite news|author=El Nasser, Haya |url=http://www.usatoday.com/news/parenting-family/babies/story/2011-08-25/Minority-babies-almost-the-majority/50127816/1|title= Minority babies almost the majority|date= 2011-08-24|work=USA TODAY|accessdate=2011-10-17}}</ref> and are projected to constitute the majority by 2042.<ref>{{cite web|url=http://www.census.gov/Press-Release/www/releases/archives/population/012496.html|archiveurl=http://web.archive.org/web/20080822044429/http://www.census.gov/Press-Release/www/releases/archives/population/012496.html|archivedate=2008-08-22|title=An Older and More Diverse Nation by Midcentury|publisher=U.S. Census Bureau|date=2008-08-14|accessdate=2008-09-06}}</ref>

About 82% of Americans live in [[United States urban area|urban areas]] (including suburbs);<ref name="WF"/> about half of those reside in cities with populations over 50,000.<ref>{{cite web | url = http://factfinder.census.gov/servlet/GCTTable?_bm=y&-state=gct&-ds_name=DEC_2000_SF1_U&-_box_head_nbr=GCT-P1&-mt_name=&-_caller=geoselect&-geo_id=&-format=US-1&-_lang=en| title = United States—Urban/Rural and Inside/Outside Metropolitan Area (GCT-P1. Population, Housing Units, Area, and Density: 2000)| publisher = U.S. Census Bureau | date =2000-04-01| accessdate = 2008-09-23 }}</ref> In 2008, 273 [[List of United States cities by population|incorporated places]] had populations over 100,000, nine cities had more than 1 million residents, and four [[global city|global cities]] had over 2 million ([[New York City]], [[Los Angeles]], [[Chicago]], and [[Houston]]).<ref name=PopEstBigCities>{{cite web | url = http://hawaii.gov/dbedt/info/census/popestimate/copy_of_2008-subcounty-population-hawaii/SUB_EST2008_01.pdf | archiveurl = http://www.webcitation.org/5lpvuJk99 | archivedate = 2009-12-07|format=PDF| title =Table 1: Annual Estimates of the Resident Population for Incorporated Places Over 100,000, Ranked by July 1, 2008 Population: April 1, 2000 to July 1, 2008 | work = 2008 Population Estimates | publisher = U.S. Census Bureau, Population Division | date =2009-07-01| accessdate = 2009-10-11}}</ref> There are fifty-two [[Table of United States Metropolitan Statistical Areas|metropolitan areas]] with populations greater than 1 million.<ref name=PopEstMSA>{{cite web | url = http://hawaii.gov/dbedt/info/census/popestimate/2008_MSA_Hawaii/CBSA_EST2008_05.pdf | archiveurl = http://www.webcitation.org/5lpvuJzkG | archivedate = 2009-12-07 |format=PDF| title = Table 5. Estimates of Population Change for Metropolitan Statistical Areas and Rankings: July 1, 2007 to July 1, 2008 | work = 2008 Population Estimates | publisher = U.S. Census Bureau| date =2009-03-19| accessdate = 2009-10-11}}</ref> Of the fifty fastest-growing metro areas, forty-seven are in the West or South.<ref>{{cite web|url=http://www.census.gov/newsroom/releases/archives/population/cb09-45.html|title=Raleigh and Austin are Fastest-Growing Metro Areas|publisher=U.S. Census Bureau|date=2009-03-19|accessdate=2009-10-11}}</ref> The metro areas of [[Dallas]], Houston, [[Atlanta]], and [[Phoenix, Arizona|Phoenix]] all grew by more than a million people between 2000 and 2008.<ref name=PopEstMSA/>
<center>{{Largest Metropolitan Areas of the United States}}</center>
{{-}}

===Language===
{{Main|Languages of the United States}}
{{See also|Language Spoken at Home|List of endangered languages in the United States}}
{|class="infobox" style="font-size: 90%; border: 1px solid #999; float: right; margin-left: 1em; width: 200px;"
|- style="background:#f5f5f5;"
!colspan="2"|Languages (2010)<ref name=Lang>"Language Spoken at Home by the U.S. Population, 2010", American Community Survey, U.S. Census Bureau, in ''World Almanac and Book of Facts 2012'', p. 615.</ref>
|-
|[[English language|English]] (''only'')||style="text-align: center;"|229.7 million
|-
|[[Spanish language|Spanish]], incl. [[Spanish-based creole languages|Creole]]||style="text-align: center;"|37.0 million
|-
|[[Chinese language|Chinese]]||style="text-align: center;"|2.8 million
|-
|[[French language|French]], incl. [[French-based creole languages|Creole]]||style="text-align: center;"|2.1 million
|-
|[[Tagalog language|Tagalog]]||style="text-align: center;"|1.6 million
|-
|[[Vietnamese language|Vietnamese]]||style="text-align: center;"|1.4 million
|-
|[[Korean language|Korean]]||style="text-align: center;"|1.1 million
|-
|[[German language|German]]||style="text-align: center;"|1.1 million
|}

[[American English|English]] is the de facto [[national language]]. Although there is no [[official language]] at the federal level, some laws—such as [[United States nationality law#Naturalization|U.S. naturalization requirements]]—standardize English. In 2010, about 230 million, or 80% of the population aged five years and older, spoke only English at home. [[Spanish language in the United States|Spanish]], spoken by 12% of the population at home, is the second most common language and the most widely taught second language.<ref name=Lang/><ref>{{cite web| url = http://www.adfl.org/resources/enrollments.pdf| title = Foreign Language Enrollments in United States Institutions of Higher Learning|date=fall 2002| publisher = MLA| accessdate = 2006-10-16}}</ref> Some Americans advocate making English the country's official language, as it is in at least twenty-eight states.<ref name=ILW>{{cite web |author=Feder, Jody |url= http://www.ilw.com/immigrationdaily/news/2007,0515-crs.pdf |title= English as the Official Language of the United States: Legal Background and Analysis of Legislation in the 110th Congress |date=January 25, 2007 |publisher= Ilw.com (Congressional Research Service) |accessdate= June 19, 2007}}</ref> Both [[Hawaiian language|Hawaiian]] and English are official languages in Hawaii by state law.<ref>{{cite web|url=http://www.hawaii.gov/lrb/con/conart15.html|title=The Constitution of the State of Hawaii, Article XV, Section 4| publisher=Hawaii Legislative Reference Bureau|date=1978-11-07|accessdate=2007-06-19}}</ref>

While neither has an official language, [[New Mexico]] has laws providing for the use of both English and Spanish, as [[Louisiana]] does for English and French.<ref>{{cite book| author =Dicker, Susan J. | title = Languages in America: A Pluralist View |year=2003|pages=216, 220–25 | location =Clevedon, UK| publisher = Multilingual Matters|isbn=1-85359-651-5}}</ref> Other states, such as [[California]], mandate the publication of Spanish versions of certain government documents including court forms.<ref>{{cite web|url=http://www.leginfo.ca.gov/cgi-bin/displaycode?section=ccp&group=00001-01000&file=412.10-412.30|title=California Code of Civil Procedure, Section 412.20(6)| publisher=Legislative Counsel, State of California|accessdate=2007-12-17}} {{cite web|url=http://www.courtinfo.ca.gov/forms/allforms.htm|title=California Judicial Council Forms| publisher=Judicial Council, State of California|accessdate=2007-12-17}}</ref> Many jurisdictions with large numbers of non-English speakers produce government materials, especially voting information, in the most commonly spoken languages in those jurisdictions. Several insular territories grant official recognition to their native languages, along with English: [[Samoan language|Samoan]] and [[Chamorro language|Chamorro]] are recognized by American Samoa and Guam, respectively; [[Carolinian language|Carolinian]] and Chamorro are recognized by the Northern Mariana Islands; Spanish is an official language of Puerto Rico.

===Religion===
[[File:BrunswickWhiteChurch.jpg|thumb|upright|A [[Presbyterianism|Presbyterian]] church; most Americans identify as Christian.]]
{{Main|Religion in the United States}}
{{See also|History of religion in the United States|Freedom of religion in the United States|Separation of church and state in the United States|List of religious movements that began in the United States}}

The United States is officially a [[secular state|secular nation]]; the [[First Amendment to the United States Constitution|First Amendment]] of the U.S. Constitution guarantees the free exercise of religion and forbids the establishment of any [[Established church|religious governance]]. In a 2002 study, 59% of Americans said that religion played a "very important role in their lives", a far higher figure than that of any other wealthy nation.<ref>{{cite web|url=http://pewglobal.org/reports/display.php?ReportID=167|title=Among Wealthy Nations...U.S. Stands Alone in its Embrace of Religion| publisher=Pew Research Center|work=Pew Global Attitudes Project|date=2002-12-19|accessdate=2008-10-23}}</ref> According to a 2007 survey, 78.4% of adults identified themselves as [[Christianity in the United States|Christian]],<ref name="Pew">{{cite web|url=http://religions.pewforum.org/pdf/affiliations-all-traditions.pdf|title=Religious Composition of the U.S.| publisher=Pew Forum on Religion & Public Life|work=U.S. Religious Landscape Survey|year=2007|accessdate=2008-10-23}}</ref> down from 86.4% in 1990.<ref name="ARIS">{{cite web|url=http://www.gc.cuny.edu/CUNY_GC/media/CUNY-Graduate-Center/PDF/ARIS/ARIS-PDF-version.pdf?ext=.pdf|title=American Religious Identification Survey 2001|author=Kosmin, Barry A., Egon Mayer, and Ariela Kaysar| publisher=CUNY Graduate Center|date=2001-12-19|accessdate=2011-09-16}}</ref> [[Protestantism|Protestant]] denominations accounted for 51.3%, while [[Catholic Church in the United States|Roman Catholicism]], at 23.9%, was the largest individual denomination. The study categorizes white [[evangelicalism|evangelicals]], 26.3% of the population, as the country's largest religious cohort;<ref name="Pew"/> another study estimates evangelicals of all races at 30–35%.<ref>{{cite web|url=http://www.uakron.edu/bliss/docs/Religious_Landscape_2004.pdf|archiveurl=http://www.webcitation.org/5lpvuMoCD|archivedate=2009-12-07|author=Green, John C|title=The American Religious Landscape and Political Attitudes: A Baseline for 2004| publisher=University of Akron Ray C. Bliss Institute of Applied Politics|accessdate=2007-06-18}}</ref> The total reporting non-Christian religions in 2007 was 4.7%, up from 3.3% in 1990.<ref name="ARIS"/> The leading non-Christian faiths were [[American Jews|Judaism]] (1.7%), [[Buddhism in the United States|Buddhism]] (0.7%), [[Islam in the United States|Islam]] (0.6%), [[Hinduism in the United States|Hinduism]] (0.4%), and [[Unitarian Universalism]] (0.3%).<ref name="Pew"/> The survey also reported that 16.1% of Americans described themselves as [[agnosticism|agnostic]], [[atheism|atheist]], or simply having [[irreligion|no religion]], up from 8.2% in 1990.<ref name="Pew"/><ref name="ARIS"/> Doubt about the existence of God is growing rapidly among Americans under 30.<ref>{{cite web|url=http://religion.blogs.cnn.com/2012/06/12/pew-survey-doubt-of-god-growing-quickly-among-millennials/|author=Merica, Dan|title=Pew Survey: Doubt of God Growing Quickly among Millennials| publisher=CNN|date=2012-06-12|accessdate=2012-06-14}}</ref>

===Family structure===
In 2007, 58% of Americans age 18 and over were married, 6% were widowed, 10% were divorced, and 25% had never been married.<ref>{{cite web|url=http://www.census.gov/prod/2008pubs/09statab/pop.pdf|publisher=U.S. Census Bureau|work=Statistical Abstract of the United States 2009| title=Table 55—Marital Status of the Population by Sex, Race, and Hispanic Origin: 1990 to 2007|accessdate = 2009-10-11}}</ref> Women now mostly work outside the home and receive a majority of [[Educational attainment in the United States|bachelor's degrees]].<ref>{{cite web |url=http://www.iserp.columbia.edu/news/articles/female_college.html |archiveurl=http://web.archive.org/web/20070609151527/http://www.iserp.columbia.edu/news/articles/female_college.html |archivedate=2007-06-09 |title=Women's Advances in Education |publisher=Columbia University, Institute for Social and Economic Research and Policy |year=2006 |accessdate=2007-06-06}}</ref>

[[Same-sex marriage in the United States|Same-sex marriage]] is a contentious issue. Some states permit [[Civil union in the United States|civil unions]] or [[Domestic partnership in the United States|domestic partnerships]] in lieu of marriage. Since 2003, [[Same-sex marriage law in the United States by state|several states]] have legalized gay marriage as the result of judicial or legislative action. Meanwhile, the [[Defense of Marriage Act|federal government]] and a majority of states define marriage as between a man and a woman and/or explicitly prohibit same-sex marriage. [[Public opinion of same-sex marriage in the United States|Public opinion on the issue]] has shifted from general opposition in the 1990s to a statistical deadlock, to a [[Public opinion of same-sex marriage in the United States#Polls in 2012|majority in support]].<ref>{{cite web|url=http://www.gallup.com/poll/147662/First-Time-Majority-Americans-Favor-Legal-Gay-Marriage.aspx |title=For First Time, Majority of Americans Favor Legal Gay Marriage |publisher=Gallup.com |date= |accessdate=2011-07-10}}</ref>

The U.S. teenage pregnancy rate, 79.8 per 1,000 women, is the highest among OECD nations.<ref>{{cite web|url=http://www.nationmaster.com/graph/peo_tee_bir_rat-people-teenage-birth-rate |title=Teenage birth rate statistics&nbsp;– countries compared&nbsp;– NationMaster People |publisher=Nationmaster.com |date= |accessdate=2011-07-10}}</ref> [[abortion in the United States|Abortion]] policy was left to the states until the Supreme Court [[Roe v. Wade|legalized the practice in 1973]]. The issue remains highly controversial, with [[abortion in the United States#Public opinion|public opinion closely divided]] for many years. [[Abortion in the United States by state|Many states]] ban public funding of the procedure and restrict late-term abortions, require parental notification for minors, and mandate a waiting period. While the abortion rate is falling, the abortion ratio of 241 per 1,000 live births and abortion rate of 15 per 1,000 women aged 15–44 remain higher than those of most Western nations.<ref>{{cite web |url=http://www.cdc.gov/mmwr/preview/mmwrhtml/ss5511a1.htm|author=Strauss, Lilo T., et al.|title=Abortion Surveillance—United States, 2003|accessdate = 2007-06-17 |publisher=Centers for Disease Control, National Center for Chronic Disease Prevention and Health Promotion, Division of Reproductive Health|work=MMWR|date=2006-11-24}}</ref>

==Culture==
{{Main|Culture of the United States}}
{{See also|Social class in the United States}}
[[File:Liberty-statue-from-below.jpg|right|thumb|The [[Statue of Liberty]] in [[New York City]] is a globally recognized symbol of both the United States and ideals such as freedom, democracy, and opportunity.<ref>{{cite web| title = Statue of Liberty| work=World Heritage| publisher=UNESCO| url = http://whc.unesco.org/en/list/307| accessdate = 2011–10–20}}</ref>]]
The United States is a [[multiculturalism|multicultural]] nation, home to a wide variety of ethnic groups, traditions, and values.<ref name="DD"/><ref name="Society in Focus">Thompson, William, and Joseph Hickey (2005). ''Society in Focus''. Boston: Pearson. ISBN 0-205-41365-X.</ref> Aside from the now small [[Native Americans in the United States|Native American]] and [[Native Hawaiians|Native Hawaiian]] populations, nearly all Americans or their ancestors immigrated within the past five centuries.<ref>Fiorina, Morris P., and Paul E. Peterson (2000). ''The New American Democracy''. London: Longman, p. 97. ISBN 0-321-07058-5.</ref> Mainstream American culture is a [[Western culture]] largely derived from the [[European American|traditions of European immigrants]] with influences from many other sources, such as [[African-American culture|traditions brought by slaves from Africa]].<ref name="DD"/><ref>Holloway, Joseph E. (2005). ''Africanisms in American Culture'', 2d ed. Bloomington: Indiana University Press, pp. 18–38. ISBN 0-253-34479-4. Johnson, Fern L. (1999). ''Speaking Culturally: Language Diversity in the United States''. Thousand Oaks, Calif., London, and New Delhi: Sage, p. 116. ISBN 0-8039-5912-5.</ref> More recent immigration from [[Asian American|Asia]] and especially [[Latin American culture|Latin America]] has added to a cultural mix that has been described as both a homogenizing [[melting pot]], and a heterogeneous [[salad bowl (cultural idea)|salad bowl]] in which immigrants and their descendants retain distinctive cultural characteristics.<ref name="DD"/>

American culture is considered the most [[individualism|individualistic]] in the world.<ref>{{cite web|url=http://www.clearlycultural.com/geert-hofstede-cultural-dimensions/individualism/|title=Individualism| publisher = Clearly Cultural|accessdate=2009-02-28}}</ref> The [[American Dream]], or the perception that Americans enjoy high [[social mobility]], plays a key role in attracting immigrants.<ref>{{cite news|url=http://www.oecd.org/dataoecd/2/7/45002641.pdf|title=A Family Affair: Intergenerational Social Mobility across OECD Countries|publisher=OECD| work = Economic Policy Reforms: Going for Growth|year=2010 |accessdate=2010-09-20}} {{cite web|url=http://www.suttontrust.com/reports/IntergenerationalMobility.pdf|title=Intergenerational Mobility in Europe and North America|author=Blanden, Jo, Paul Gregg, and Stephen Malchin| publisher = Centre for Economic Performance|month=April | year=2005 |accessdate=2006-08-21 |archiveurl = http://web.archive.org/web/20060623094610/http://www.suttontrust.com/reports/IntergenerationalMobility.pdf |archivedate = June 23, 2006}}</ref> While the mainstream culture holds that the United States is a [[classless society]],<ref>{{cite book |last=Gutfield |first=Amon |year=2002 |title=American Exceptionalism: The Effects of Plenty on the American Experience |publisher=Sussex Academic Press |location=Brighton and Portland |page=65 |isbn=1-903900-08-5}}</ref> scholars identify significant differences between the country's social classes, affecting [[socialization]], language, and values.<ref>{{cite book |last=Zweig |first=Michael |year=2004 |title=What's Class Got To Do With It, American Society in the Twenty-First Century |publisher=Cornell University Press |location=Ithaca, NY |isbn=0-8014-8899-0}} {{cite web |url=http://eric.ed.gov/ERICWebPortal/Home.portal?_nfpb=true&_pageLabel=RecordDetails&ERICExtSearch_SearchValue_0=ED309843&ERICExtSearch_SearchType_0=eric_accno&objectId=0900000b800472a5 |title=Effects of Social Class and Interactive Setting on Maternal Speech |publisher=Education Resource Information Center |accessdate=2007-01-27}}</ref> The [[American middle class|American middle and professional class]] has initiated many contemporary social trends such as [[History of women in the United States|modern feminism]], [[Environmental movement in the United States|environmentalism]], and multiculturalism.<ref>{{cite book |last=Ehrenreich |first=Barbara |year=1989 |title=Fear of Falling, The Inner Life of the Middle Class |publisher=HarperCollins |location=New York |isbn=0-06-097333-1}}</ref> Americans' self-images, social viewpoints, and cultural expectations are associated with their occupations to an unusually close degree.<ref>{{cite book |last=Eichar |first=Douglas |year=1989 |title=Occupation and Class Consciousness in America |publisher=Greenwood Press |location=Westport, CT |isbn=0-313-26111-3}}</ref> While Americans tend greatly to value socioeconomic achievement, being [[Average Joe|ordinary or average]] is generally seen as a positive attribute.<ref>{{cite book |last=O'Keefe |first=Kevin |year=2005 |title=The Average American |publisher=PublicAffairs |location=New York |isbn=1-58648-270-X}}</ref>

===Popular media===
{{Main|Cinema of the United States|Television in the United States|Music of the United States}}
[[File:PB050006.JPG|thumb|left|The [[Hollywood Sign]] in [[Los Angeles]], [[California]].]]
The world's first commercial motion picture exhibition was given in New York City in 1894, using [[Thomas Edison]]'s [[Kinetoscope]]. The next year saw the first commercial screening of a projected film, also in New York, and the United States was in the forefront of [[sound film]]'s development in the following decades. Since the early 20th century, the U.S. film industry has largely been based in and around [[Hollywood]], California. Director [[D. W. Griffith]] was central to the development of [[film grammar]] and [[Orson Welles]]'s ''[[Citizen Kane]]'' (1941) is frequently cited as the greatest film of all time.<ref>[http://www.filmsite.org/villvoice.html ''Village Voice'': 100 Best Films of the 20th century (2001)]. Filmsite.org; [http://www.bfi.org.uk/sightandsound/topten/poll/critics-long.html ''Sight and Sound'' Top Ten Poll 2002]. BFI. Retrieved on 2007-06-19.</ref> American screen actors like [[John Wayne]] and [[Marilyn Monroe]] have become iconic figures, while producer/entrepreneur [[Walt Disney]] was a leader in both [[animation|animated film]] and movie [[merchandising]]. The [[major film studio]]s of Hollywood have produced the most commercially successful movies in history, such as ''[[Star Wars Episode IV: A New Hope|Star Wars]]'' (1977) and ''[[Titanic (1997 film)|Titanic]]'' (1997), and the products of Hollywood today dominate the global film industry.<ref>{{cite web |url=http://www.unesco.org/bpi/eng/unescopress/2000/00-120e.shtml |title=World Culture Report 2000 Calls for Preservation of Intangible Cultural Heritage |date=2000-11-17 |publisher=UNESCO |accessdate=2007-09-14}} {{cite web |url=http://www1.worldbank.org/economicpolicy/globalization/thwart.html |archiveurl=http://web.archive.org/web/20071017111347/http://worldbank.org/economicpolicy/globalization/thwart.html |archivedate=2007-10-17 |title=Summary: Does Globalization Thwart Cultural Diversity? |publisher=World Bank Group |accessdate=2007-09-14}}</ref>

Americans are the heaviest television viewers in the world,<ref>{{cite web |url=http://www.nationmaster.com/graph/med_tel_vie-media-television-viewing |title=Media Statistics > Television Viewing by Country |publisher=NationMaster |accessdate=2007-06-03}}</ref> and the average viewing time continues to rise, reaching five hours a day in 2006.<ref>{{cite web |url=http://www.emarketer.com/Article.aspx?R=1005003 |title=Broadband and Media Consumption |date=2007-06-07|publisher=eMarketer |accessdate=2007-06-10}}</ref> The four major broadcast networks are all commercial entities. Americans listen to radio programming, also largely commercialized, on average just over two-and-a-half hours a day.<ref>{{cite web |url=http://www.emarketer.com/Article.aspx?R=1004830 |title=TV Fans Spill into Web Sites |date=2007-06-07|publisher=eMarketer |accessdate = 2007-06-10}}</ref> Aside from [[web portal]]s and [[web search engine|search engines]], the most popular websites are [[Facebook]], [[YouTube]], [[Wikipedia]], [[Blogger (service)|Blogger]], [[eBay]], and [[Craigslist]].<ref name="alexa-topsitesus">{{cite web |url=http://www.alexa.com/topsites/countries/US |title=Top Sites in United States |year=2010 |publisher=Alexa |accessdate=2010-03-27}}</ref>

The rhythmic and lyrical styles of [[African-American music]] have deeply influenced [[Music of the United States|American music]] at large, distinguishing it from European traditions. Elements from [[folk music|folk]] idioms such as the [[blues]] and what is now known as [[old-time music]] were adopted and transformed into [[popular music|popular genres]] with global audiences. [[Jazz]] was developed by innovators such as [[Louis Armstrong]] and [[Duke Ellington]] early in the 20th century. [[Country music]] developed in the 1920s, and [[rhythm and blues]] in the 1940s. [[Elvis Presley]] and [[Chuck Berry]] were among the mid-1950s pioneers of [[rock and roll]]. In the 1960s, [[Bob Dylan]] emerged from the [[American folk music revival|folk revival]] to become one of America's most celebrated songwriters and [[James Brown]] led the development of [[funk]]. More recent American creations include [[hip hop music|hip hop]] and [[house music]]. American pop stars such as Presley, [[Michael Jackson]], and [[Madonna (entertainer)|Madonna]] have become global celebrities.<ref>Biddle, Julian (2001). ''What Was Hot!: Five Decades of Pop Culture in America''. New York: Citadel, p. ix. ISBN 0-8065-2311-5.</ref>

===Literature, philosophy, and the arts===
{{Main|American literature|American philosophy|American art|American classical music}}

[[File:Kerouac by Palumbo.jpg|thumb|upright|[[Jack Kerouac]], one of the best-known figures of the [[Beat Generation]], a group of writers that came to prominence in the 1950s]]
In the 18th and early 19th centuries, American art and literature took most of its cues from Europe. Writers such as [[Nathaniel Hawthorne]], [[Edgar Allan Poe]], and [[Henry David Thoreau]] established a distinctive American literary voice by the middle of the 19th century. [[Mark Twain]] and poet [[Walt Whitman]] were major figures in the century's second half; [[Emily Dickinson]], virtually unknown during her lifetime, is now recognized as an essential American poet.<ref>[[Harold Bloom|Bloom, Harold]]. 1999. ''Emily Dickinson''. Broomall, PA: Chelsea House Publishers. p. 9. ISBN 0-7910-5106-4.</ref> A work seen as capturing fundamental aspects of the national experience and character—such as [[Herman Melville]]'s ''[[Moby-Dick]]'' (1851), Twain's ''[[Adventures of Huckleberry Finn|The Adventures of Huckleberry Finn]]'' (1885), and [[F. Scott Fitzgerald]]'s ''[[The Great Gatsby]]'' (1925)—may be dubbed the "[[Great American Novel]]".<ref>{{cite journal|author=Buell, Lawrence|title=The Unkillable Dream of the Great American Novel: ''Moby-Dick'' as Test Case |year= 2008|work=American Literary History|volume=20|issue=1–2|pages=132–155|doi=10.1093/alh/ajn005|journal=American Literary History|month=Spring/Summer|issn=0896-7148}}</ref>

Eleven U.S. citizens have won the [[Nobel Prize in Literature]], most recently [[Toni Morrison]] in 1993. [[William Faulkner]] and [[Ernest Hemingway]] are often named among the most influential writers of the 20th century.<ref>Quinn, Edward (2006). ''A Dictionary of Literary and Thematic Terms''. Infobase, p. 361. ISBN 0-8160-6243-9. Seed, David (2009). ''A Companion to Twentieth-Century United States Fiction''. Chichester, West Sussex: John Wiley and Sons, p. 76. ISBN 1-4051-4691-5. Meyers, Jeffrey (1999). ''Hemingway: A Biography''. New York: Da Capo, p. 139. ISBN 0-306-80890-0.</ref> Popular literary genres such as the [[Western fiction|Western]] and [[hardboiled|hardboiled crime fiction]] developed in the United States. The [[Beat Generation]] writers opened up new literary approaches, as have [[postmodern literature|postmodernist]] authors such as [[John Barth]], [[Thomas Pynchon]], and [[Don DeLillo]].

The [[transcendentalism|transcendentalists]], led by Thoreau and [[Ralph Waldo Emerson]], established the first major [[American philosophy|American philosophical movement]]. After the Civil War, [[Charles Sanders Peirce]] and then [[William James]] and [[John Dewey]] were leaders in the development of [[pragmatism]]. In the 20th century, the work of [[Willard Van Orman Quine|W. V. O. Quine]] and [[Richard Rorty]], and later [[Noam Chomsky]], brought [[analytic philosophy]] to the fore of American philosophical academia. [[John Rawls]] and [[Robert Nozick]] led a revival of [[political philosophy]].

In the visual arts, the [[Hudson River School]] was a mid-19th-century movement in the tradition of European [[naturalism (arts)|naturalism]]. The [[Realist visual arts|realist]] paintings of [[Thomas Eakins]] are now widely celebrated. The 1913 [[Armory Show]] in New York City, an exhibition of European [[modern art|modernist art]], shocked the public and transformed the U.S. art scene.<ref>Brown, Milton W. (1988 1963). ''The Story of the Armory Show''. New York: Abbeville. ISBN 0-89659-795-4.</ref> [[Georgia O'Keeffe]], [[Marsden Hartley]], and others experimented with new, individualistic styles. Major artistic movements such as the [[abstract expressionism]] of [[Jackson Pollock]] and [[Willem de Kooning]] and the [[pop art]] of [[Andy Warhol]] and [[Roy Lichtenstein]] developed largely in the United States. The tide of modernism and then [[postmodernism]] has brought fame to American architects such as [[Frank Lloyd Wright]], [[Philip Johnson]], and [[Frank Gehry]].
[[File:Times Square 1-2.JPG|thumb|left|[[Times Square]] in [[New York City]], part of the [[Broadway theatre|Broadway theater district]]]]
One of the first major promoters of [[Theater of the United States|American theater]] was impresario [[P. T. Barnum]], who began operating a lower [[Manhattan]] entertainment complex in 1841. The team of [[Edward Harrigan|Harrigan and Hart]] produced a series of popular [[musical theatre|musical]] comedies in New York starting in the late 1870s. In the 20th century, the modern musical form emerged on [[Broadway theatre|Broadway]]; the songs of musical theater composers such as [[Irving Berlin]], [[Cole Porter]], and [[Stephen Sondheim]] have become [[Traditional pop music|pop standards]]. Playwright [[Eugene O'Neill]] won the Nobel literature prize in 1936; other acclaimed U.S. dramatists include multiple [[Pulitzer Prize for Drama|Pulitzer Prize]] winners [[Tennessee Williams]], [[Edward Albee]], and [[August Wilson]].

Though little known at the time, [[Charles Ives]]'s work of the 1910s established him as the first major U.S. composer in the classical tradition, while experimentalists such as [[Henry Cowell]] and [[John Cage]] created a distinctive American approach to classical composition. [[Aaron Copland]] and [[George Gershwin]] developed a new synthesis of popular and classical music. [[Choreography|Choreographers]] [[Isadora Duncan]] and [[Martha Graham]] helped create [[modern dance]], while [[George Balanchine]] and [[Jerome Robbins]] were leaders in 20th-century ballet. Americans have long been important in the modern artistic medium of [[photography]], with major photographers including [[Alfred Stieglitz]], [[Edward Steichen]], and [[Ansel Adams]]. The newspaper [[comic strip]] and the [[American comic book|comic book]] are both U.S. innovations. [[Superman]], the quintessential comic book [[superhero]], has become an American icon.<ref>{{cite book | last=Daniels | first=Les | authorlink=Les Daniels | year=1998 | title=Superman: The Complete History | page=11 | edition=1st | publisher=[[Titan Books]] | isbn=1-85286-988-7 }}</ref>

===Food===
{{Main|American cuisine}}
Mainstream American cuisine is similar to that in other Western countries. Wheat is the primary cereal grain. Traditional American cuisine uses indigenous ingredients, such as turkey, venison, potatoes, sweet potatoes, corn, squash, and maple syrup, which were consumed by Native Americans and early European settlers. Slow-cooked pork and beef barbecue, crab cakes, potato chips, and chocolate chip cookies are distinctively American foods. [[Soul food]], developed by African slaves, is popular around the South and among many African Americans elsewhere. [[Syncretism|Syncretic]] cuisines such as [[Louisiana Creole cuisine|Louisiana creole]], [[Cajun cuisine|Cajun]], and [[Tex-Mex]] are regionally important.

Characteristic dishes such as apple pie, fried chicken, pizza, hamburgers, and hot dogs derive from the recipes of various immigrants. French fries, Mexican dishes such as burritos and tacos, and pasta dishes freely adapted from Italian sources are widely consumed.<ref name="IFT">{{cite web |url=http://www.newswise.com/articles/what-when-and-where-americans-eat-in-2003|author=Klapthor, James N. |title=What, When, and Where Americans Eat in 2003 |publisher=Newswise/Institute of Food Technologists |date=2003-08-23|accessdate=2007-06-19}}</ref> Americans generally prefer coffee to tea. Marketing by U.S. industries is largely responsible for making orange juice and milk ubiquitous breakfast beverages.<ref>Smith, Andrew F. (2004). ''The Oxford Encyclopedia of Food and Drink in America''. New York: Oxford University Press, pp. 131–32. ISBN 0-19-515437-1. Levenstein, Harvey (2003). ''Revolution at the Table: The Transformation of the American Diet''. Berkeley, Los Angeles, and London: University of California Press, pp. 154–55. ISBN 0-520-23439-1.</ref>

The American [[fast food]] industry, the world's largest, pioneered the [[drive-through]] format in the 1930s. Fast food consumption has sparked health concerns. During the 1980s and 1990s, Americans' caloric intake rose 24%;<ref name="IFT" /> frequent dining at fast food outlets is associated with what public health officials call the American "[[Obesity in the United States|obesity epidemic]]".<ref>Boslaugh, Sarah (2010). "Obesity Epidemic", in ''Culture Wars: An Encyclopedia of Issues, Viewpoints, and Voices'', ed. Roger Chapman. Armonk, N.Y.: M. E. Sharpe, pp. 413–14. ISBN 978-0-7656-1761-3.</ref> Highly sweetened soft drinks are widely popular, and sugared beverages account for 9% of American caloric intake.<ref>{{cite web |title=Fast Food, Central Nervous System Insulin Resistance, and Obesity |publisher=American Heart Association |year=2005 |work=[[Arteriosclerosis, Thrombosis, and Vascular Biology]] |url=http://atvb.ahajournals.org/cgi/content/full/25/12/2451#R3-101329 |accessdate=2007-06-09}} {{cite web |title=Let's Eat Out: Americans Weigh Taste, Convenience, and Nutrition |publisher=U.S. Dept. of Agriculture |url=http://www.ers.usda.gov/publications/eib19/eib19_reportsummary.pdf|accessdate=2007-06-09}}</ref>

===Sports===
{{Main|Sports in the United States}}
[[File:Shea Smith-edit1.jpg|thumb|A [[college football]] [[quarterback]] looking to [[forward pass|pass]] the ball]]
[[Baseball]] has been regarded as the [[national sport]] since the late 19th century, while [[American football]] is now by several measures the most popular spectator sport.<ref>{{cite web |author=Krane, David K. |title=Professional Football Widens Its Lead Over Baseball as Nation's Favorite Sport |url=http://www.harrisinteractive.com/Insights/HarrisVault8482.aspx?PID=337 |publisher=Harris Interactive |date=2002-10-30|accessdate=2007-09-14}} Maccambridge, Michael (2004). ''America's Game: The Epic Story of How Pro Football Captured a Nation''. New York: Random House. ISBN 0-375-50454-0.</ref> [[Basketball]] and [[ice hockey]] are the country's next two leading professional team sports. [[College football]] and [[College basketball|basketball]] attract large audiences. Boxing and horse racing were once the most watched individual sports,<ref>{{cite web |author=Cowen, Tyler, and Kevin Grier |title=What Would the End of Football Look Like?|url=http://www.grantland.com/story/_/id/7559458/cte-concussion-crisis-economic-look-end-football|publisher=Grantland/ESPN|date=2012-02-09|accessdate=2012-02-12}}</ref> but they have been eclipsed by [[golf]] and [[auto racing]], particularly [[NASCAR]]. [[Association football|Soccer]] is played widely at the youth and amateur levels. [[Tennis]] and many outdoor sports are popular as well.

While most major U.S. sports have evolved out of European practices, [[volleyball]], [[skateboarding]], [[snowboarding]], and [[cheerleading]] are American inventions. Basketball was invented in Massachusetts by Canadian-born [[James Naismith]]. [[Lacrosse]] and [[surfing]] arose from Native American and Native Hawaiian activities that predate Western contact. Eight [[Olympic Games]] have [[United States at the Olympics|taken place in the United States.]] The United States has won 2,301 medals at the [[Summer Olympic Games]], more than any other country,<ref>{{cite web|title=All-Time Medal Standings, 1896–2004 | publisher = Information Please|url=http://www.infoplease.com/ipsa/A0115108.html | accessdate=2007-06-14}} {{cite web|title=Distribution of Medals—2008 Summer Games| publisher = Fact Monster|url=http://www.factmonster.com/sports/olympics/2008/distribution-medals-summer-games.html| accessdate=2008-09-02}}</ref> and 253 in the [[Winter Olympic Games]], the second most.<ref>{{cite web|title=All-Time Medal Standings, 1924–2006|publisher=Information Please|url=http://www.infoplease.com/ipsa/A0115207.html|accessdate=2007-06-14}} {{cite web|title=Olympic Medals|publisher=Vancouver Organizing Committee|url=http://www.vancouver2010.com/olympic-medals/|accessdate=2010-03-02}} Norway is first.</ref>{{Clear}}

===Measurement systems===
{{main|United States customary units}}
The nation retains United States customary units, comprising mainly former British [[imperial units]] such as [[mile]]s, [[yard]]s, and degrees [[Fahrenheit]]. Distinct units include the U.S. [[gallon]] and U.S. [[pint]] volume measurements. The United States is one of only three countries that do not rely primarily on the [[International System of Units]]. However, [[metric system|metric units]] are increasingly used in science, medicine, and many industrial fields.<ref>{{cite web|url=https://www.cia.gov/library/publications/the-world-factbook/appendix/appendix-g.html|title=Appendix G: Weights and Measures|publisher=CIA|work=The World Factbook|date=|accessdate=2010-04-01}}</ref>

==See also==
{{portal|North America|United States}}
*Topic overview:
<!-- **[[United States]] -->
**[[Outline of the United States]]
**[[Index of United States-related articles]]
**[[Book:United States]]
*[[List of U.S. states#Lists|Lists of U.S. states]]
{{clear}}

==References==
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==External links==
{{Sister project links}}
<!--Please:
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*{{CIA World Factbook link|us|United States}}
*[http://infousa.state.gov/ InfoUSA] Portal to U.S. Information Agency resources
*[http://www.loc.gov/index.html Library of Congress] Official site of the U.S. [[Library of Congress]]
*[http://www.teacheroz.com/states.htm The 50 States of the U.S.A.] Collected informational links for each state
*{{osmrelation-inline|148838}}
*[[wikitravel:United States of America|United States travel guide]] from [[Wikitravel]]
*[http://www.britannica.com/EBchecked/topic/616563/United-States United States] ''Encyclopædia Britannica'' entry
*{{dmoz|Regional/North_America/United_States}}
*[http://www.census.gov/hhes/www/ U.S. Census Housing and Economic Statistics] Wide-ranging data from the [[U.S. Census Bureau]]
*[http://www.uscis.gov/portal/site/uscis U.S. Citizenship and Immigration Services] Official government site
* [http://www.ers.usda.gov/statefacts/ State Fact Sheets] Population, employment, income, and farm data from the U.S. [[Economic Research Service]]
* [http://tonto.eia.doe.gov/state/ State Energy Profiles] Economic, environmental, and energy data for each state from the U.S. [[Energy Information Administration]]
* [http://wiki.creativecommons.org/Category:USA Category:USA] in the [[Creative Commons]]. Websites and projects for free usage under a Creative Commons license.
* [http://www.ifs.du.edu/ifs/frm_CountryProfile.aspx?Country=US Key Development Forecasts for the United States] from [[International Futures]]
;Government
*[http://www.usa.gov/ Official U.S. Government Web Portal] Gateway to government sites
*[http://www.house.gov/ House] Official site of the United States House of Representatives
*[http://www.senate.gov/ Senate] Official site of the United States Senate
*[http://www.whitehouse.gov/ White House] Official site of the President of the United States
*[{{SCOTUS URL}} Supreme Court] Official site of the Supreme Court of the United States
;History
* [http://www.nationalcenter.org/HistoricalDocuments.html Historical Documents] Collected by the National Center for Public Policy Research
* [http://www.religioustolerance.org/nat_mott.htm U.S. National Mottos: History and Constitutionality] Analysis by the Ontario Consultants on Religious Tolerance
* [http://www.historicalstatistics.org/index2.html USA] Collected links to historical data
;Maps
* [http://nationalatlas.gov/ National Atlas of the United States] Official maps from the U.S. Department of the Interior
<!-* [http://www.wikimapia.org/#y=41771312&x=-99492187&z=4&l=0&m=a United States] Satellite view at [[WikiMapia]] (not affiliated with Wikipedia/[[Wikimedia Foundation]])-->
* {{wikiatlas|the United States}}

{{Anchor|Related information}}<!-- target for Navbox link at See also section -->
{{United States Template Group}}

[[Category:United States| ]]
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[[Category:Member states of NATO]]
[[Category:Member states of the United Nations]]
[[Category:Northern American countries]]
[[Category:States and territories established in 1776]]
[[Category:Superpowers]]
[[Category:1776 establishments in the United States]]

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[[ace:Amirika Carékat]]
[[kbd:Америкэ Штат Зэгуэт]]
[[af:Verenigde State van Amerika]]
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[[bar:Vaeinigte Staatn]]
[[bo:ཨ་མེ་རི་ཁ་རྒྱལ་ཕྲན་མཉམ་འབྲེལ་རྒྱལ་ཁབ།]]
[[bs:Sjedinjene Američke Države]]
[[br:Stadoù-Unanet Amerika]]
[[ca:Estats Units d'Amèrica]]
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[[dz:ཡུ་ནའིཊེཊ་སི་ཊེས]]
[[et:Ameerika Ühendriigid]]
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[[got:𐌱𐌰𐌽𐌳𐌰𐍂𐌴𐌹𐌺𐌾𐌰]]
[[hak:Mî-koet]]
[[xal:Америкин Ниицәтә Орн Нутгуд]]
[[ko:미국]]
[[ha:Amurika]]
[[haw:‘Amelika Hui Pū ‘ia]]
[[hy:Ամերիկայի Միացյալ Նահանգներ]]
[[hi:संयुक्त राज्य अमेरिका]]
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[[ka:ამერიკის შეერთებული შტატები]]
[[csb:Zjednóné Kraje Americzi]]
[[kk:Америка Құрама Штаттары]]
[[kw:Statys Unys]]
[[rw:Leta Zunze Ubumwe z’Amerika]]
[[rn:Leta z’Unze Ubumwe za Amerika]]
[[sw:Marekani]]
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[[ht:Etazini]]
[[ku:Dewletên Yekbûyî yên Amerîkayê]]
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[[lad:Estatos Unitos d'Amerika]]
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[[lez:Америкадин Садхьанвай Штатар]]
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[[om:USA]]
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[[pt:Estados Unidos]]
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[[rm:Stadis Unids]]
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[[scn:Stati Uniti]]
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[[simple:United States]]
[[sd:آمريڪا]]
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[[so:Mareykanka]]
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[[tet:Estadu Naklibur Sira Amérika Nian]]
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[[tg:Иёлоти Муттаҳидаи Амрико]]
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[[chy:United States]]
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[[udm:Америкалэн Огазеяськем Штатъёсыз]]
[[uk:Сполучені Штати Америки]]
[[ur:ریاستہائے متحدہ امریکہ]]
[[ug:ئامېرىكا قوشما شىتاتلىرى]]
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[[vec:Stati Unii de ła Mèrica]]
[[vep:Amerikan Ühtenzoittud Valdkundad]]
[[vi:Hoa Kỳ]]
[[vo:Lamerikän]]
[[fiu-vro:Ameeriga Ütisriigiq]]
[[wa:Estats Unis]]
[[zh-classical:美國]]
[[vls:Verênigde Stoaten van Amerika]]
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[[wo:Diiwaan yu Bennoo]]
[[wuu:美利坚合众国]]
[[ts:United States]]
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[[yo:Àwọn Ìpínlẹ̀ Aṣọ̀kan Amẹ́ríkà]]
[[zh-yue:美國]]
[[diq:Dewletê Amerikayê Yewbiyayey]]
[[zea:Vereênigde Staeten]]
[[bat-smg:JAV]]
[[zh:美國]]

Revision as of 17:18, 11 July 2012

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