SAN JOSE LAS FLORES, Guatemala — Gilberto Ramos wanted to leave his chilly mountain village for the United States to earn money to treat his mother’s epilepsy. His mother begged him not to go. “The better treatment would have been if he stayed,” Cipriana Juarez Diaz said in a tearful interview with The Associated Press on Tuesday. When he wouldn’t relent, she draped him with a white rosary for safe passage. A month later, his decaying body was found in the Texas desert. Now, the boy has become a symbol for the perils faced by a record flood of unaccompanied...