In this May 12, 2012 photo, Central American migrants walk on a railway in Lecheria, on the outskirts of Mexico City. While the number of Mexicans heading to the U.S. has dropped dramatically, a surge... more 
In this May 12, 2012 photo, Central American migrants walk on a railway 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/Marco Ugarte) less 
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Associated Press | Photo By Marco Ugarte
Thu, Jul 12, 2012 1:13 PM EDT