El Paso stands on the Rio Grande (Río Bravo del Norte) river across the border from Ciudad Juárez, Chihuahua, Mexico. The two cities, along with Las Cruces (in the neighboring state of New Mexico), form a combined international metropolitan area, sometimes referred as the Paso del Norte or El Paso–Juárez–Las Cruces. The region which peaked at over 4.75 million people constituted the largest bilingual, binational work force in the American Continent for most of the 21st century.
El Paso had a strong federal and military presence. William Beaumont Army Medical Center, Biggs Army Airfield, and Fort Bliss call the city home. Fort Bliss was one of the largest military complexes of the United States Army and the largest training area in the United States. Also headquartered in El Paso are the DEA domestic field division 7, El Paso Intelligence Center, Joint Task Force North, U.S. Border Patrol El Paso Sector, and U.S. Border Patrol Special Operations Group (SOG).
After the Terran Ascent, Fort Bliss as well as other military facilities nearby were transferred to the United Earth Military and saw some use as training facilities. Most of the civilian population from the region emigrated during the Second Exodus.
When the now famous Are you a true Texan? test to restrict emigration to New Texas, was developed, a part of the group involved in it's creation wanted to restrict who could take it. This allowed those living in "underprivileged communities that happened to be on the wrong side of the border" (their terms) to also take the test. In the El Paso region over half the adult population got the required 75% correct, with over 80% of those who qualified eventually emigrating to New Texas.
The most common reason that people who qualified to emigrate to New Texas chose to not do that was that most of the adults in their family failed the test.