Across the border from El Paso, Texas, a mass exodus triggered by a murderous prohibitionist war for drug trafficking routes into the United States has left huge swaths of Ciudad Juarez uninhabited, rocking Mexican home builders and gutting the large industrial city of its upwardly mobile working class. Residents are fleeing many towns along the Mexican border, but the migration is perhaps most acutely felt in Juarez, which until recently was among Mexico's fastest-growing cities, its industrial jobs attracting immigrants from across the country and Central America.