Chamizal dispute
The Chamizal dispute was an international land and boundary conflict over contested land (estimates range from 600 to 1,600 acres [240–650 ha; 2.4–6.5 km2]) along the Mexico–United States border between El Paso, Texas, and Ciudad Juárez, Chihuahua. The conflict was caused by multiple meandering, southward shifts in the Rio Grande, which delineates the U.S.-Mexico boundary in this region.