Alva Review-Courier -

SALEM, Ore. (AP) — The young man traversed Andean mountains, plains and cities in buses, took a harrowing boat ride in which five fellow migrants drowned, walked through thick jungle for days, and finally reached the U.S.-Mexico border.

Then Abdoulaye Camara, from the poor West African country of Mauritania, asked U.S. officials for asylum.

Camara's arduous journey highlights how immigration to the United States through its southern border is evolving. Instead of being almost exclusively people from Latin America, the stream of migrants crossing the Mexican border these days includes many who...