CIUDAD JUÁREZ, Mexico— In this border city, large groups of migrants marching toward the U.S. have all but halted. Migrant encampments are disappearing, and few people are trying to sneak across

Spivey, 33 years old, got back in his Silverado and fired several shots from inside the truck before going limp. He had been headed home after a Saturday afternoon drinking beer and whiskey at the