Agua Prieta. In English that means “dark water,” an ominous name for a town. It sits on the border between Mexico and the U.S., a region that’s had more than its share of darkness in recent years.

Add Yahoo as a preferred source to see more of our stories on Google. Of course, A.P., as the locals call it, is hardly the only place in Mexico that’s suffered during the carnage that’s claimed an ...