The History of Arizona
The U.S. acquired the northern part of Arizona in 1848 with the Treaty of Guadalupe Hidalgo. The area south of the Gila River was added in 1853 with the 1853 Gadsden Purchase. At first, Arizona was a part of the Territory of New Mexico. Arizona became a separate territory in 1863. The U.S. made Arizona the 48th state in 1912.
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Image source: Arizona and the United States Postal Service Collection (Arizona Memory Project)
