109,073,023 (2008 est.)
|Largest city||Los Angeles (pop. 3,792,621)|
|Largest Metropolitan Area||Greater Los Angeles (pop. 18,880,000 as of 2009 estimate)|
The Sun Belt is a region of the United States generally considered to stretch across the South and Southwest (the geographic southern United States). Another rough boundary of the region is the area south of the 36th parallel, north latitude. The main defining feature of the Sun Belt is its warm-temperate climate with extended summers and brief, relatively mild winters; Florida, the Gulf Coast, and southern Texas, however, have a true subtropical climate.
The Belt has seen substantial population growth since the 1960s due to an influx of immigrants, both legal and illegal; a surge in retiring baby boomers; and the attractiveness of a mild winter climate. This population boom has been less substantial in Louisiana, Mississippi, and Alabama compared with their western and eastern neighbor states. Also, over the past several decades, air conditioning has made it easier for people to deal with the heat in portions of the region during the summertime. Water shortages, droughts, and drug trafficking are becoming a common problem in the region.
The Belt comprises the southern tier of the United States o include the states of ], Arizona, Florida, Georgia, Louisiana, Mississippi, New Mexico, South Carolina, Tennessee, Texas, roughly half of California (up to Greater Sacramento), and at least parts of Arkansas, North Carolina, and southern Nevada. A more expansive definition includes the states of Colorado, Oklahoma, Virginia, Utah, and all of California and Nevada.
Author and political analyst Kevin Phillips claims to have coined the term "to describe the oil, military, aerospace and retirement country stretching from Florida to California" in his 1969 book The Emerging Republican Majority.
The term "Sun Belt" became synonymous with the southern third of the nation in the early 1970s. There was a shift in this period from the previously economically and politically important northeast to the south and west. Events such as the huge migration of immigrant workers from Mexico, warmer climate, and a boom in the agriculture industry allowed for the southern third of the United States to grow economically. The climate spurred not only agricultural growth, but also saw many retirees move into retirement communities in the region, especially in Florida and Arizona.
Industries such as aerospace, defense, and oil boomed in the Sun Belt as companies took advantage of the low involvement of labor unions in the south (due to more recent industrialization; 1930s to 1950s) and enjoyed the proximity to many U.S. military installations who were the major consumers of their products. The oil industry helped propel southern states such as Texas and Louisiana forward, and tourism grew in Florida and southern California as well. In more recent decades high tech and new economy industries have been major drivers of growth in California, Florida and some other parts of the Sun Belt. Texas and California rank among the top five states in the nation with the most number of Fortune 500 companies, with New York, Illinois, and Pennsylvania rounding out the top five.
Since 1970 Sun Belt states have gained 25 electoral votes. Since Lyndon B. Johnson's election in 1964, every elected United States President, with the exception of Barack Obama from Illinois, has been from the Sun Belt. (Gerald Ford, who was from Michigan, became president following Richard Nixon's resignation, but was not elected as president, and lost to Georgia's Jimmy Carter in the 1976 election.)
As of 2005 the U.S. Census Bureau projected that approximately 88% of the U.S. population growth between 2000 and 2030 will occur in the Sun Belt. California, Texas, and Florida are each expected to add more than 12 million people during that time, which will make them, by far, the most populous states in America. Arizona, North Carolina, and metropolitan Atlanta are also expected to make major population gains. Nevada, Arizona, Florida, and Texas are expected to be the fastest-growing states.
Events leading up to and including the 2008-2009 recession have led many to question whether growth projections for the Sun Belt have been overstated. The economic bubble that led to the recession appears, to many observers, to have been more acute in the Sun Belt than many other parts of the country. Additionally the traditional lure of cheaper labor markets in the belt compared to many of the older industrial centers has been eroded by the overseas outsourcing trend of the recent decade.
One of the greatest threats facing the Belt in the coming decades is water shortages. Communities in California are making plans to build potentially multiple desalination plants to supply fresh water and avert near-term crises. Texas, Georgia and Florida also face increasingly serious shortages because of their rapidly expanding populations.
The environment in the Belt is extremely valuable, not only to local and state governments, but to the federal government. Eight of the ten states have extremely high biodiversity (ranging from 3,800 to 6,700 species, not including marine life). The Sun Belt also has the highest number of distinct ecosystems: chaparral, deciduous, desert, grasslands, and tropical rainforest. From the marshes on Florida's mainland to its extensive coral reefs, this state leads the entire United States in terms of its diversity in animal and plant species.
Major cities within the Sun Belt 
Largest metropolitan areas Principal City Population (2012 est.)
Los Angeles 18.2 $755.0 San Francisco 8.4 $335.3 Dallas 7.1 $401.3 Miami 6.4 $260.0 Houston 6.4 $420.4 Atlanta 6.1 $283.8 Phoenix 4.3 $194.4 San Diego 3.2 $175.0 Orlando 2.9 $105.0 Tampa 2.8 $115.2 Charlotte 2.5 $117.8 International regions San Diego–Tijuana 5.0 (2009 est.) $176 El Paso–Juárez 2.5 (2005 est.)
The four largest metropolitan areas are the Los Angeles, San Francisco, Dallas, and Miami metro areas. The Los Angeles area is by far the largest with almost 18.2 million inhabitants as of 2010. The ten largest metropolitan areas are found in the states of California, Texas, Georgia, North Carolina, Florida, and Arizona. Additionally, the cross-border metrolitan areas of San Diego - Tijuana and El Paso - Juárez lie partially within this belt. Seven of the ten largest cities (proper) in the United States are located in the Sun Belt: Los Angeles (2nd), Houston (4th), Phoenix (5th), San Antonio (7th), San Diego (8th), Dallas (9th), and San Jose (10th).
See also 
- "State & County QuickFacts". US Census Bureau. Retrieved 2008-07-24.
- Woods, Michael (18 January 1981). "Desert-Like Conditions Hurt Sun Belt". The Blade (Toledo, OH), reprinted by Google News Archive
- Sun Belt entry at encyclopedia.com, credited to the Columbia Encyclopedia.
- Sun Belt entry at infoplease, credited to the Columbia Encyclopedia.
- Phillips, Kevin (2 April 2006). "How the GOP Became God's Own Party". Washington Post. Retrieved 5 September 2012.
- Sun Belt Growth Shapes Housing's Future, Professional Builder, 1 May 2005
- Lewan, Todd: Has economic twilight come to the Sun Belt?, MSNBC, 31 May 2009
- Cetron, Marvin J.; O'Toole, Thomas: Encounters with the future: a forecast of life into the 21st century, Mcgraw-Hill, April 1982, pg. 34
- Shankman, Sabrina: California Gives Desalination Plants a Fresh Look , Wall Street Journal, 10 July 2009
- McGovern, Bernie: Florida Almanac 2007-2008, Pelican Publishing Company, March 2007, pg. 53
- Annual Estimates of the Population of Combined Statistical Areas, United States Census Bureau, July 2012
- U.S. Metro Economies: Gross Metropolitan Product with Housing Update, The United States Conference of Mayors, July 2012
Further reading 
- Weinstein, Bernard L.; Robert E. Firestine (1978). Regional growth and decline in the United States: the rise of the Sunbelt and the decline of the Northeast. Praeger Publishers. ISBN 9780275239503.
- Hollander, Justin B. (2011). Sunburnt Cities: The Great Recession, Depopulation, and Urban Planning in the American Sunbelt. Taylor & Francis. ISBN 9780415592116.