Number of US illegal immigrants from Mexico drops
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Credit: Getty Images
TOHONO O'ODHAM NATION, AZ - JANUARY 18: A discarded shoe lies along the porous U.S.-Mexico border fence which stretches through the Sonoran Desert on January 18, 2011 in the Tohono O'odham Nation, Arizona. The Native American reservation, which lies along 72 miles of the U.S.-Mexico border, is a key crossing point for narcotics entering the United States. (Photo by John Moore/Getty Images)
