Number of US illegal immigrants from Mexico drops
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TOHONO O'ODHAM NATION, AZ - JANUARY 18: A U.S. Border Patrol agent closes a gate in the U.S.-Mexico border fence on January 18, 2011 in the Tohono O'odham Nation, Arizona. The Native American reservation, which stradles 72 miles of the border, has several border gates through which Indians are allowed to pass freely between the United States and Mexico. (Photo by John Moore/Getty Images)
