For as long as Sister Norma Pimentel can remember, the shelter she runs in the border city of McAllen, Texas, has been crowded with thousands of migrants fleeing natural disasters, violence, authoritarian governments and poverty.

For as long as Sister Norma Pimentel can remember, the shelter she runs in the border city of McAllen, Texas, has been crowded with thousands of migrants fleeing natural disasters, violence, authoritarian governments and poverty.