U.S. immigration law and the legal categorizations it imposes on migrants shape the journeys of migrant children from Central America as they move through Mexico toward the southern U.S. border, according to a new Yale study. U.S. immigration law and the legal categorizations it imposes on migrants shape the journeys of migrant children from Central America as they move through Mexico toward the southern U.S. border, according to a new Yale study. Social Sciences Political science Phys.org – latest science and technology news stories