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Mexico City
Mexico City, where James Gadsden and General López de Santa Anna signed the Gadsden Purchase

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The Gadsden Purchase Was Signed in Mexico City
December 30, 1853

Meeting in Mexico City on December 30, 1853, James Gadsden, U.S. Minister to Mexico, and General Antonio López de Santa Anna, president of Mexico, signed the Gadsden Purchase. The treaty settled the dispute over the exact location of the Mexican border west of El Paso, Texas, giving the U.S. claim to approximately 29,600 square miles of land in what is now southern New Mexico and Arizona, for the price of $10 million.
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