A caravan of some 1,500 Latin American migrants, welcomed into Mexico on their 1,900-mile trek to the United States where they plan to demand asylum, was welcomed by a third Mexican town 400 miles into their journey. On Facebook, organizer Pueblo Sin Fronteras wrote, “Thanks to the community Matias Romero for his solidarity with the caravan viacrusis migrants in the fight.” It also gave a PayPal account to offer donations. And Washington-based reporters reached out through the Facebook account for help covering the caravan. The town is about 400 miles from the Mexican-Guatemalan border. When they crossed that border, the...