WASHINGTON – Thousands of children split from their families at the U.S. southern border are being held in government-run facilities. A look at how we got here, what's real and what's not, and what might happen next. HOW DID WE GET HERE? Tens of thousands of parents and children, mostly from Honduras, El Salvador and Guatemala, have been caught crossing the U.S.-Mexico border illegally in recent years with stories of fleeing drug cartels, extreme poverty and gang violence.