was between 19 the first barrier built by Mexico was likely in 1918, and barriers were extended in the 1920s and 1940s.

The first international bridge was the Brownsville & Matamoros International Bridge built in 1910. Territorial exchanges in the Mexican-American War (1846-48) and the Gadsden Purchase (1853) would largely establish the current U.S.-Mexico border. Two men scale the border fence into Mexico near Douglas, Arizona, in 2009 Origins US stateĬhihuahua, Coahuila, Nuevo León, Tamaulipas states along the border are California, Arizona, New Mexico, and Texas. Border states include the Mexican states of Baja California, Sonora, Chihuahua, Coahuila, Nuevo León, and Tamaulipas. The Mexico–United States border stretches from the Pacific Ocean in the west to the Gulf of Mexico in the east. Such immigrants must cross fifty miles (80 km) of inhospitable terrain to reach the first road, which is located in the Tohono O'odham Indian Reservation. Īs a result of the barrier, there has been a significant increase in the number of people trying to cross areas that have no fence, such as the Sonoran Desert and the Baboquivari Mountains in Arizona. And while the barrier is along the Mexico-United States border, 80% of the apprehended crossers are non-Mexican. This shows a recent increase in apprehensions.

Border apprehensions in 2010 were at their lowest level since 1972. economic conditions and border enforcement efforts. The decrease in apprehensions are the result of numerous factors, including changes in U.S. illegally) by the Border Patrol in 2010 occurred at the southwest border. ĩ7% of border apprehensions (foreign nationals who are caught being in the U.S. The fencing includes a steel fence (varying in height between 18 and 27 feet) that divides the border towns of Nogales, Arizona, in the U.S. These urban areas include San Diego, California, and El Paso, Texas. The barrier is located on both urban and uninhabited sections of the border, areas where the most concentrated numbers of illegal crossings and drug trafficking have been observed in the past. The border from the Gulf of Mexico to El Paso, Texas, follows along the Rio Grande forming a natural barrier. The 1,954 miles (3,145 km) border between the United States and Mexico traverses a variety of terrains, including urban areas and deserts.

3.4.1 Contractors and independent efforts.

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