Although illegal border crossings have declined dramatically in recent years, more and more children are crossing the border alone.

Nearly 14,000 unaccompanied minors were apprehended in U.S. and sent back to Mexico in 2012 alone, and nearly 25,000 unaccompanied children total were apprehended by U.S. border patrol in the same fiscal year. That's a 204% increase in such crossings from 2008.