The Gadsden Purchase was an 1853 agreement between the United States and Mexico, where the U.S. acquired about 29,670 square miles in the southern parts of present-day New Mexico and Arizona.
What was the Gadsden Purchase? The Gadsden Purchase was an 1853 agreement between the United States and Mexico, where the U.S. acquired about 29,670 square miles in the southern parts of present-day New Mexico and Arizona.