Under terms of the 1963 Chamizal Convention the U.S.-Mexico border was changed officially in aThe U.S. simultaneously received 193 acres of Mexican territory, the Northern half of Cordova Island.
ceremony in El Paso, TX on December 13, 1968. Presidents Johnson and Díaz Ordaz, standing on a bridge
between the two countries, set off an explosion shifting the Rio Grande into a new 4.5-mile concrete
channel placing all the 176.92 hectares of the disputed El Chamizal area on the Mexican side of the river.