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A Central American migrant man carrying a child walks along the highway through Tonala, Chiapas state, Mexico, Sunday, April 21, 2019, as the migrant caravan heads to the U.S. border. The outpouring of aid that once greeted Central American migrants as they trekked in caravans through southern Mexico has been drying up, so this group is hungrier, advancing slowly or not at all, and hounded by unhelpful local officials. (AP Photo/Moises Castillo)