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The '''Gadsden Purchase''' or '''Gadsden Treaty''' (in Mexico, called the '''Mesilla Treaty ''') of 1853 was the acquisition by the U.S. from Mexico of 29.1 million acres in a strip of borderland for $10 million.  The area became part of Arizona and New Mexico, and was essential for a southern transcontinental route that was used for the Southern Pacific Railroad. The chief city is Tucson, Arizona.

The '''Gadsden Purchase''' or '''Gadsden Treaty''' (in Mexico, called the '''Mesilla Treaty''') of 1853 was the acquisition by the U.S. from Mexico of 29.1 million acres in a strip of borderland for $10 million.  The area became part of Arizona and New Mexico, and was essential for a southern transcontinental route that was used for the Southern Pacific Railroad. The chief city is Tucson, Arizona.

[[Image:Gadsden-map.jpg|thumb|375px]]

[[Image:Gadsden-map.jpg|thumb|375px]]