Asylum seeker Yareni, age five, flips through the pages of a book in an encampment where she lives near the Gateway International Bridge in Matamoros, Mexico.

Asylum seeker Yareni, age five, flips through the pages of a book in an encampment where she lives near the Gateway International Bridge in Matamoros, Mexico. The United States has sent most of the migrants living there back to Mexico to wait for their asylum case under the "Remain in Mexico" program, officially called the Migrant Protection Protocols.

© 2019 Veronica G. Cardenas/AP Photo