By: Jim Briggs, Artis Curiskis, Taki Telonidis, Nikki Frick, Fernando Arruda, Al Letson, Zulema Cobb, Brett Myers, Steven Rascón, Anayansi Diaz-Cortes
US policies triggered a cycle of violence in Mexico, putting innocent families in harm's way. Many have fled north to seek asylum at the border.