Mexico–United States border
The Mexico–United States border is an international border running from Imperial Beach, California, and Tijuana, Baja California, in the west to Matamoros, Tamaulipas, and Brownsville, Texas, in the east. The border, separating Mexico and the United States from each other, traverses a variety of terrains, ranging from major urban areas to inhospitable deserts. From the Gulf of Mexico, it follows the course of the Rio Grande (Río Bravo del Norte) to the border crossing at El Paso, Texas, and Ciudad Juárez, Chihuahua; westward from that binational conurbation it crosses vast tracts of the Sonoran and Chihuahuan Desert, the Colorado River Delta, westward to the binational conurbation of San Diego and Tijuana before reaching the Pacific Ocean.
The border's total length is 3,145 km (1,954 mi), according to figures given by the International Boundary and Water Commission. It is the most frequently crossed international border in the world, with approximately 350 million people legally crossing per year.
- 1 Geography
- 2 History
- 3 Security
- 4 Environmental Health of the Border Region
- 5 Travel
- 6 The Fence
- 7 Animals
- 8 See also
- 9 References
- 10 References
- 11 External links
The 1,969 mile (3,169 km) international border follows the middle of the Rio Grande—according to the 1848 Treaty of Guadalupe Hidalgo between the two nations, "along the deepest channel" (also known as the thalweg)—from its mouth on the Gulf of Mexico a distance of 2,019 km (1,255 mi) to a point just upstream of El Paso and Ciudad Juárez. It then follows an alignment westward overland and marked by monuments a distance of 858 km (533 mi) to the Colorado River, during which it reaches its highest elevation at the intersection with the Continental Divide. Thence it follows the middle of that river northward a distance of 38 km (24 mi), and then it again follows an alignment westward overland and marked by monuments a distance of 226 km (140 mi) to the Pacific Ocean.
The official 'border region' extends 60 km (38 miles) north and south of the aforementioned boundaries and 60 km (38 miles) east into the Gulf of Mexico and 60 km (38 miles) west into the Pacific Ocean.
The region is characterized by deserts, rugged hills, abundant sunshine, and two major rivers—the Colorado and the Rio Grande (Río Bravo del Norte)—which provide life-giving waters to the largely arid but fertile lands along the rivers in both countries.
Texas borders four Mexican states—Tamaulipas, Nuevo León, Coahuila, and Chihuahua—the most of any U.S. state. New Mexico and Arizona each border two Mexican states (Chihuahua and Sonora; Sonora and Baja California, respectively). California borders only Baja California.
Three Mexican states border two U.S. states each: Baja California borders California and Arizona; Sonora, borders Arizona and New Mexico; and Chihuahua borders New Mexico and Texas. Tamaulipas, Nuevo León, and Coahuila each border only one U.S. state: Texas.
There are currently 45 U.S.–Mexico border crossings with 330 ports of entry. From west to east, below is a list of the border city twinnings, which are municipalities connected by one or more legal border crossings.
- San Diego, California (San Ysidro) – Tijuana, Baja California (San Diego–Tijuana Metro.)
- Otay Mesa, California – Tijuana, Baja California
- Tecate, California – Tecate, Baja California
- Calexico, California – Mexicali, Baja California
- Andrade, California – Los Algodones, Baja California
- San Luis, Arizona – San Luis Río Colorado, Sonora
- Lukeville, Arizona – Sonoita, Sonora
- Sasabe, Arizona – Altar, Sonora
- Nogales, Arizona – Nogales, Sonora
- Naco, Arizona – Naco, Sonora
- Douglas, Arizona – Agua Prieta, Sonora
- Antelope Wells, New Mexico – El Berrendo, Chihuahua
- Columbus, New Mexico – Palomas, Chihuahua
- Santa Teresa, New Mexico – San Jerónimo, Chihuahua
- El Paso, Texas – Ciudad Juárez, Chihuahua
- Fabens, Texas – Práxedis G. Guerrero, Chihuahua municipality
- Fort Hancock, Texas – El Porvenir, Chihuahua
- Presidio, Texas – Ojinaga, Chihuahua
- Heath Canyon, Texas – La Linda, Coahuila (closed)
- Del Rio, Texas – Ciudad Acuña, Coahuila
- Eagle Pass, Texas – Piedras Negras, Coahuila
- Laredo, Texas – Nuevo Laredo, Tamaulipas
- Laredo, Texas – Colombia, Nuevo León
- Falcon Heights, Texas – Presa Falcón, Tamaulipas
- Roma, Texas – Ciudad Miguel Alemán, Tamaulipas
- Rio Grande City, Texas – Ciudad Camargo, Tamaulipas
- Los Ebanos, Texas – Gustavo Diaz Ordaz, Tamaulipas
- Mission, Texas – Reynosa, Tamaulipas
- Hidalgo, Texas – Reynosa, Tamaulipas
- Pharr, Texas – Reynosa, Tamaulipas
- Donna, Texas – Rio Bravo, Tamaulipas
- Progreso, Texas – Nuevo Progreso, Tamaulipas
- Los Indios, Texas – Matamoros, Tamaulipas
- Brownsville, Texas – Matamoros, Tamaulipas
For a list of legal border crossings of the Mexico – US border, see List of Mexico–United States border crossings.
In the mid-16th century, with the discovery of silver, settlers from a variety of countries and backgrounds began to arrive in the area. This period of sparse settlement included colonizers from different backgrounds. The area technically was part of the Spanish colony, but due to the lack of population and the diverse citizenry it had, it did not seem to belong to any country. This period lasted until the early 19th century at which point the United States bought the lands known as the Louisiana Purchase from France and began to expand steadily westward in its pursuit of Manifest Destiny.
The border itself was not clearly defined and remained so until the Mexican colony became independent from Spain and entered a period of political instability. Mexico attempted to create a buffer zone at the border that would prevent possible invasion from the North. In order to do so the Mexican government encouraged thousands of their own citizens to settle in the region that is now known as Texas and even offered very inexpensive land to settlers from the United States in exchange for populating the area. The influx of people did not provide the defense that Mexico had hoped for and instead Texas declared its independence in 1836. That independence lasted until 1845 when the United States annexed Texas.
The constant conflicts in the Texas region in the mid 19th century eventually led to the Mexican-American War, which began in 1846 and ended in 1848 with the Treaty of Guadalupe Hidalgo. Due to the treaty Mexico lost more than 960,000 square miles (about 2,500,000 km²) of land, 55% of its national territory, including what is today California, Arizona, New Mexico, Utah, Nevada and parts of Colorado, Wyoming, Kansas, and Oklahoma. In addition, all disputes over Texas and the disputed territory between Rio Grande and Rio Nueces were abandoned. Five years later the Gadsden Purchase completed the creation of the current United States–Mexico border. The purchase was initially to accommodate a planned railway right-of-way. These purchases left approximately 300,000 people living in the once disputed lands, many of whom were Mexican nationals. Following the establishment of the current border a number of towns sprang up along this boundary and many of the Mexican citizens were given free land in the northern regions of Mexico in exchange for returning and repopulating the area.
The Treaty of Guadalupe Hidalgo and the Treaty of 1884 were the agreements originally responsible for the settlement of the international border, both of which specified that the middle of Rio Grande was the border—irrespective of any alterations in the channels or banks. The Rio Grande shifted south between 1852 and 1868, with the most radical shift in the river occurring after a flood in 1864. By 1873 the river had moved approximately 600 acres (2.4 km2), cutting off land that was in effect made United States territory. By a treaty negotiated in 1963, Mexico regained most of this land in what became known as the Chamizal dispute and transferred 264 acres (1.07 km2) in return to the United States. Border treaties are jointly administered by the International Boundary and Water Commission, which was established in 1889 to maintain the border, allocate river waters between the two nations, and provide for flood control and water sanitation. Once viewed as a model of international cooperation, in recent decades the IBWC has been heavily criticized as an institutional anachronism, by-passed by modern social, environmental and political issues.
The economic development of the border region on the Mexican side of the border depended largely on its proximity to the United States due to its remoteness from the commercial centers in Mexico. During the years of Mexican President Porfirio Díaz, between 1876 and 1910, growth of the border communities boomed due mostly to its close ties to the United States and the Mexican governments support for financial investments from the United States. Railroads were built that connected the northern Mexican states more to the United States than to Mexico and the population grew tremendously. The mining industry also developed, as did the United States’ control of it. By the early 20th century companies from the United States controlled 81% of the mining industry and had invested five hundred million dollars in the Mexican economy overall, twenty-five percent of which went to the border regions alone.
The Mexican Revolution, caused at least partially by the increasing animosity towards foreign ownership of Mexican properties, began in 1910. The Revolution increased the political instability in Mexico, but actually did not significantly slow United States investment. It did reduce economic development within Mexico however, and the border regions reflected this. As the infrastructure of communities on the United States side of the boundary continued to improve, its Mexican counterparts began to fall behind in the construction of important transportation networks and systems necessary to municipal development as well as the upkeep of systems already in place.
U.S.–Mexico border enforcement
|This section's factual accuracy may be compromised due to out-of-date information. (December 2009)|
The U.S.–Mexico border has the second highest number of both legal and illegal crossings of any land border in the world, behind the Canada–United States border. Over five million cars and trucks travel through the border annually. According to Vulliamy, one in five Mexican nationals will visit or work in the United States at one point in their lifetime. The border is guarded by more than twenty thousand border patrol agents, more than any time in its history. However, they only have "effective control" of less than 700 miles (1,100 km) of the 1,954 miles (3,145 km) of total border, with an ability to actually prevent or stop illegal entries along 129 miles (208 km) of that border. The border is paralleled by United States Border Patrol Interior Checkpoints at major roads generally between 25 and 75 miles (121 km) to the U.S. side of the border, and garitas generally within 50 km of the border on the Mexican side.
There are an estimated half a million illegal entries into the United States each year. Border Patrol activity is concentrated around big border cities such as San Diego and El Paso which do have extensive border fencing. This means that the flow of illegal immigrants is diverted into rural mountainous and desert areas, leading to several hundred migrant deaths along the Mexico–U.S. border of those attempting to cross into the United States from Mexico illegally.
The Secure Fence Act of 2006 was passed providing for the construction of 700 miles (1,100 km) of high-security fencing. Attempts to complete the construction of the United States–Mexico barrier have been challenged by the Mexican government and various U.S.–based organizations.
In January 2013, the Government Accountability Office released a report stating that the United States Border Patrol only intercepts sixty one percent of individuals illegally crossing the border in 2011, which translated to 208,813 individuals not being apprehended. 85,827 of the 208,813 would go on to illegally enter the United States, while the rest returned into Mexico. The report also showed that the number of illegal border crossings have dropped.
According to the United States Border Patrol, in the fiscal year of 2006, there were twenty-nine confirmed border incursions by Mexican government officials, of which seventeen were by armed individuals. Since 1996 there have been 253 incursions by Mexican government officials.
The Washington Times has reported that on Sunday, August 3, 2008, Mexican military personnel who crossed into Arizona from Mexico encountered a U.S. Border Patrol agent, whom they held at gunpoint. The soldiers later returned to Mexico, as backup Border Patrol agents came to investigate.
Disagreements over need for more resources
||The neutrality of this article is disputed. (August 2012)|
Proponents of greater spending on the border – especially politicians from border states – argue that continuing the buildup is necessary due to increased violence and drug trafficking from Mexico spilling over into the United States. However, critics such as the Washington Office on Latin America have argued that the buildup has led to a confusing, uncoordinated tangle of agencies and that a comprehensive border security strategy is needed in order to better focus spending.
Environmental Health of the Border Region
The La Paz Agreement was signed into law on August 14, 1983 and became enforceable on February 16, 1984. This agreement to protect the environment is the political foundation between the U.S. and Mexico for 4 subsequent programs. Each program has addressed environmental destruction in the border region resulting from the rise of the maquiladora industries, those who migrated to Northern Mexico to work in the industries, the lack of infrastructure to accommodate the people, Mexico's lax regulations concerning all these factors, the resulting spillover into the U.S., and the U.S.'s own environmentally destructive tendencies. The programs were: IBEP (1992), Border XXI (1996), Border 2012 (2003) and Border 2020 (2012). 
Western Hemisphere Travel Initiative
In late 2006, the United States Department of Homeland Security (DHS) announced a rule regarding new identification requirements for U.S. citizens and international travelers entering the United States implemented on January 23, 2007; this final rule and first phase of the WHTI specifies nine forms of identification—one of which is required in order to enter the United States by air: a valid passport; a passport card; a state enhanced driver's license or state enhanced non-driver ID card (available in Michigan, New York, Vermont, and Washington) approved by the Secretary of Homeland Security; a trusted traveler program card (NEXUS, FAST, or SENTRI); an enhanced tribal identification card; a Native American Tribal Photo Identification Card; Form I-872 – American Indian Card; a valid Merchant Mariner Document when traveling in conjunction with official maritime business; or a valid U.S. military identification card when traveling on official orders.
||This section is written like a travel guide rather than an encyclopedic description of the subject. (June 2011)|
Auto insurance does not travel across the Mexico–United States border. Therefore, people wishing to cross the border with a vehicle may choose to buy a short-term auto insurance policy for the country and/or state that they are crossing into. If the state in the country requires auto insurance, a policy that meets the state's liability requirements must be purchased before the vehicle may cross. Those in the United States who want to cross into Mexico with a car may choose to purchase a short-term Mexican auto insurance policy.
||This section is written like a travel guide rather than an encyclopedic description of the subject. (October 2012)|
The busiest border in the world is located in the U.S.–Mexico—to be more specific, San Diego (U.S.) to Tijuana (Mexico) at the San Ysidro Port of Entry. In the United States, Interstate 5 crosses directly to Tijuana, and the highway's southern terminus is this crossing. In 2005, more than 17 million vehicles and 50 million people entered the United States at the San Ysidro Port of Entry. Many people who cross the border are workers with dual nationalities of United States and Mexico. Crossing time is very slow in San Ysidro for people who are going toward San Diego in cars. Many people also cross the border by walking and use public transportation to go to San Diego or to go to San Ysidro.
The U.S. government had plans in 2006, during the Bush administration, to erect a border fence along the U.S.–Mexico border. The controversial proposal included creating many individual fences. Almost 600 miles of fence was constructed, with each of the individual fences composed of steel and concrete. In between these fences are infrared cameras and sensors, National Guard soldiers, and SWAT teams on alert, giving the name a "virtual fence". Construction on the fence began in 2006, with each mile costing the U.S. government about $2.8 million. In 2010, the initiative was terminated due to costs after having completed 640 miles (1,030 km) of either barrier fence or vehicle barriers that was either new or had been rebuilt over older inferior fencing. The Boeing-built SBInet systems of using radar, watchtowers, and sensors (without a fence or physical barrier) was scrapped for being overbudget, full of glitches and far behind schedule.
When animals are imported from one country to another, there is the possibility that diseases and parasites can move with them. For this reason, most countries impose animal health regulations on the import of animals. Most animals imported to the United States must be accompanied by:
- Import permits obtained in advance from the U.S. Department of Agriculture's Animal and Plant Health Inspection Service (APHIS).
- Health certification papers from the country of origin.
Veterinary inspections are often required, and are available only at designated ports; advance contact with port veterinarians is recommended. Animals crossing the United States-Mexico border may have a country of origin other than the country where they present for inspection. Such animals include those from the U.S. that cross to Mexico and return, and animals from other countries that travel overland through Mexico or the U.S. before crossing the border.
dogs, horses, and cattles
Crossing from Mexico to the United States
APHIS imposes precautions to keep out several equine diseases, including glanders, dourine, equine infectious anemia (EIA), equine piroplasmosis (EP), Venezuelan equine encephalitis (VEE), and contagious equine metritis (CEM). APHIS also checks horses to prevent the introduction of ticks and other parasites. In the Lower Rio Grande Valley, U.S. Department of Agriculture inspectors look for horses and livestock that stray across the border carrying ticks. These animals are often called wetstock, and the inspectors are referred to as tickriders.
Per APHIS, horses originating from Canada can enter the United States with a Canadian government veterinary health certificate and a negative test for EIA. Horses from Mexico must have a health certificate; pass negative tests for EIA, dourine, glanders, and EP at a USDA import center; and undergo precautionary treatments for external parasites at the port of entry. Horses from other Western Hemisphere countries must have the same tests as those from Mexico and, except for horses from Argentina, must be held in quarantine for at least seven days as a check for VEE.
APHIS imposes similar testing and certification requirements on horses from other parts of the world but without the quarantine for VEE. These horses are held in quarantine—usually three days—or until tests are completed. Because the disease equine piroplasmosis (equine babesiosis) is endemic in Mexico but not established in the United States, transportation of horses from Mexico to the United States requires evaluation of horses for the presence of this disease.
Transportation of horses from Mexico to the United States normally requires at least three days in quarantine, which is incompatible with most recreational equestrian travel across the border. A leading exception to this rule is the special waiver obtained by riders participating in the Cabalgata Binacional Villista (see cavalcade).
Crossing from the United States to Mexico
- ATF Gunwalking Scandal
- Border Field State Park
- Border Film Project
- Border Protection, Anti-terrorism, and Illegal Immigration Control Act of 2005
- International Boundary and Water Commission
- International Boundary Changes between the United States and Mexico (1910–2009)
- International child abduction in Mexico
- List of crossings of the Rio Grande
- List of Mexico–United States border crossings
- List of municipalities (municipios) and counties on the Mexico – United States border
- Mexico–United States relations
- Migrant deaths along the Mexico – United States border
- Minuteman Project
- New River (Mexico–United States)
- Open Border
- Reconquista (Mexico)
- Rio Grande border disputes
- Roosevelt Reservation
- S. 2611
- San Diego–Tijuana metropolitan area
- San Ysidro, San Diego
- Secure Fence Act of 2006
- Southwest Border Security Consortium
- Texas Virtual Border Watch
- Treaty of Limits (Mexico–United States)
- United States–Mexico barrier
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- Aduana Mexico. 2007. Aduanas 25 de las Reglas de Caracter General en Materia de Comercio Exterior para 2007.
- "Border-Crossing Deaths Have Doubled Since 1995; Border Patrol’s Efforts to Prevent Deaths Have Not Been Fully Evaluated" (PDF). Government Accountability Office. August 2006. p. 42.
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- "Mexican incursions inflame border situation". MSNBC. Retrieved 2008-01-17.
- "Border patrol agent held at gunpoint". Washington Times. Retrieved 2008-08-08.
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- "New Study Separates Rhetoric from Reality on Security and Migration Along the Border". Washington Office on Latin America. Retrieved 23 August 2012.
- Smith, Colin. "1 U.S. – Mexico Cooperation for the Health of the Environment in the Border Region: A Policy History Analysis".
- WHTI: Enhanced Drivers License
- DHS Announces Final Western Hemisphere Air Travel, Association of Cotpotrate Travel Executives, 5 December 2006, retrieved 2007-12-02Rule
- Western Hemisphere Travel Initiative: The Basics, U.S. Department of Homeland Security, retrieved 2007-12-02
- Western Hemisphere Travel Initiative, U.S. Department of State, Bureau of Consular Affairs, January 13, 2008, retrieved 2007-01-12.
- Traveling to USA?
- Sandra Dibble (11 July 2010). "Number of border crossings stabilizes". San Diego Union Tribune. Retrieved 5 January 2013.
- Hsu, Spencer S. (2010-03-16). "Work to cease on 'virtual fence' along U.S.-Mexico border". The Washington Post.
- "Ports Designated for the Importation of Animals". Animal and Plant Health Inspection Service (APHIS). Archived from the original on 2007-02-02. Retrieved 2011-10-05.
- "Port Veterinarian List". Animal and Plant Health Inspection Service (APHIS). Archived from the original on 2006-12-09. Retrieved 2011-10-05.
- "Equine Importation". Animal and Plant Health Inspection Service (APHIS). Archived from the original on 2010-10-17. Retrieved 2011-10-05.
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- Equine Disease Quarterly, Volume 12, Number 3 (October 2003)
- "Import health requirements of Mexico for horses (non slaughter) exported from the United States". Animal and Plant Health Inspection Service (APHIS). December 2005. Archived from the original on 2010-10-17. Retrieved 2011-10-05.
- Parts of this article have been adapted from The International Boundary and Water Commission, Its Mission, Organization and Procedures for Solution of Boundary and Water Problems.
- Arbelaez, Harvey, and Claudio Milman. "The New Business Environment of Latin America and the Caribbean". International Journal of Public Administration (2007): 553
- Kelly, Patricia, and Douglas Massey. "Borders for Whom? The Role of NAFTA in Mexico-U.S. Migration". The ANNALS of the American Academy of Political Science 610 (2007): 98–118.
- Miller, Tom. On the Border: Portraits of America’s Southwestern Frontier, 1981.
- Thompson, Olivia N. (2009). "Binational Water Management: Perspectives of Local Texas Officials in the U.S.-Mexico Border Region". Applied Research Projects. Texas State University. Paper 313.
- Andrew Becker and Agustin Armendariz. "California Border Crossing: San Ysidro Port Of Entry Is The Busiest Land Border In The World"  HuffPost social reading, article on California watch. (2012)
|Wikimedia Commons has media related to Borders of the United States-Mexico.|
- U.S.-Mexico Business Council
- Picture of U.S.-Mexico Border
- Border Stories: a mosaic documentary on the U.S.-Mexico Border
- Border Town—Dallas Observer
- A Continent Divided: The U.S.-Mexico War, Center for Greater Southwestern Studies, the University of Texas at Arlington
- David Taylor, The Journey to Border Monument Number 140 - photographs and description of the obelisks that mark the border
- Status of Mexican Trucks in the United States: Frequently Asked Questions Congressional Research Service