"""The shadows of Central American migrants, part of the caravan hoping to reach the U.S. border, stand in a line to board buses, on their way to Mazatlan, Mexico, Tuesday, Nov. 13, 2018. The U.S. government said it was starting work Tuesday to """"harden"""" the border crossing from Tijuana, Mexico, to prepare for the arrival of a migrant caravan leapfrogging its way across western Mexico. (AP Photo/Rodrigo Abd)"""
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