Mexico

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**FILE** An undocumented migrant, who refused to identify himself, clings to the border as he checks on the U.S. Border Patrol from the Mexico side of the United States-Mexico border in Tijuana, Mexico, on June 5, 2006. (Associated Press) (Treesaver cover)

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**FILE** An undocumented migrant, who refused to identify himself, clings to the border as he checks on the U.S. Border Patrol from the Mexico side of the United States-Mexico border in Tijuana, Mexico, on June 5, 2006. (Associated Press)

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**FILE** United States goalie Bill Hamid (1) blocks a shot from Mexico in the first half of an under-23 international friendly soccer match at FC Dallas Stadium, Wednesday, Feb. 29, 2012, in Frisco, Texas. (AP Photo/Tony Gutierrez)

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**FILE** Local self-defense squads watch as Mexican army soldiers enter the town of La Ruana, Michoacan, Mexico, on May 20, 2013. Residents of western Mexico towns who endured months besieged by a drug cartel are cheering the arrival of hundreds of Mexican army troops. (Associated Press)

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** FILE ** Migrants ride on top of a northbound train toward the U.S.-Mexico border in Juchitan in southern Mexico on Monday, April 29, 2013. Migrants crossing Mexico to get to the U.S. have increasingly become targets of criminal gangs who kidnap them to obtain ransom money. (AP Photo/Eduardo Verdugo)

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Sisters Emma Gonzalez, center, and Martha Montero [cq], left, originally from of Wahaca, Mexico wear traditional tehuanas clothing at the annual Cinco de Mayo celebration on the National Mall, Washington, D.C., Sunday, May 5, 2013. (Andrew Harnik/The Washington Times)

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Sisters Emma Gonzalez (center) and Martha Montero (left), originally from Wahaca, Mexico, wear traditional tehuanas clothing at the annual Cinco de Mayo celebration on the National Mall in Washington on Sunday, May 5, 2013. (Andrew Harnik/The Washington Times)

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Sisters Emma Gonzalez (second from left) and Martha Montero (left), originally from Wahaca, Mexico, wear traditional tehuanas clothing at the annual Cinco de Mayo celebration on the National Mall in Washington on Sunday, May 5, 2013. (Andrew Harnik/The Washington Times)

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President Obama and Mexican President Enrique Pena Nieto shake hands following their news conference at the Palacio Nacional in Mexico City on May 2, 2013. (Associated Press) **FILE**