How many people cross the border over which the Chamizal dispute  took place?
Chamizal dispute: The Chamizal dispute was a border conflict over about 600 acres on the Mexico–United States border between El Paso, Texas, and Ciudad Juárez, Chihuahua. Mexico–United States border:  s of 2010 , approximately 350 million legal crossings occur annually, and is the most frequently crossed border in the world.
approximately 350 million legal crossings