CIUDAD HIDALGO, MEXICO – JANUARY 18: Central American migrants, part of a new “migrant caravan,” rest and sleep after crossing a border bridge between Guatemala and Mexico to register at an immigration facility before dawn on January 18, 2019 in Ciudad Hidalgo, Mexico.

In recent days, more than 1,000 Central Americans have set off toward the U.S. on foot or riding in vehicles, often by hitchhiking.

 

Photo by Mario Tama/Getty Images