Caravan\'s Stymied Passage Leaves Migrant Issue Boiling

Caravan’s Stymied Passage Leaves Migrant Issue Boiling

Massive groups heading north have led to deeper U.S. political divide and complicated would-be immigrants’ plight

President Trump said the U.S. will end Central American aid as thousands of migrants march toward the U.S. border. The WSJ's Gerald F. Seib explains why this might be counterproductive. Photo: Getty

TIJUANA, Mexico—As thousands of migrants began to mass in Honduras preparing to embark on a monthlong march to the U.S. border, a migrant-rights activist tried desperately to halt their half-formed plans.

“Stop this!,” Irineo Mujica said he yelled in a frantic October phone call to Honduran politician and migrant advocate Bartolo Fuentes, who had publicized the caravan on his Facebook page.

Mr....