Associated Press
In this May 17, 2012 photo, migrants sit outside the mayor's residence after protesting violence against migrants in Lecheria, on the outskirts of Mexico City. While the number of Mexicans heading to the U.S. has dropped dramatically, a surge of Central American migrants is making the 1,000-mile northbound journey this year, fueled in large part by the rising violence brought by the spread of Mexican drug cartels. (AP Photo/Alexandre Meneghini)

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