"I feel like I have never been given the opportunity to achieve my dreams. I believe I can find my future in America,” says Maria (name changed), 17, from Honduras. She watches her young son while she checks on the status of her humanitarian visa at a UNICEF-supported shelter for unaccompanied migrant girls in Tapachula, Mexico. She says she has to stay at the shelter until she turns 18, although she is desperate to cross the U.S. border.