Nearly 19,000 unaccompanied minors entered U.S. border custody in March, an all-time monthly record. The onslaught of lone minors overwhelmed the U.S. government’s infrastructure and intake process. The largest Border Patrol facility for migrant children was at 1,640% capacity in late March, holding more than 3,200 unaccompanied minors in a facility designed for 250 people.