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[[File: Nogales-santa-cruz-county-arizona-us-border-between-arizona-and-mexico.jpg|left|250px|thumbnail| The US/Mexico Border in Nogales along the Southern border of the Gadsden Purchase]
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The Gadsden Purchase, or Treaty, was an agreement between the United States and Mexico, finalized in 1854, in which the United States agreed to pay Mexico $10 million for a 29,670 square mile portion of Mexico that later became part of Arizona and New Mexico. Gadsden’s Purchase provided the land necessary for a southern transcontinental railroad and attempted to resolve conflicts that lingered after the Mexican-American War.
