The Northern Border Free Zone was designed to attract foreign factories. Low wages proximity to the U.S. = corporate paradise. But when an entire city depends on maquiladoras, wages can’t rise too much without risk. Eso no es accidente. Es estructura. Border cities like Tijuana and Juárez are economically strategic — and vulnerable. ¿En tu ciudad se siente esta dependencia? zona libre de la frontera norte zona economica frontera mexico maquiladoras frontera norte salarios salario minimo frontera