1. 1857: The Gadsden Purchase is signed, which ceded a large portion of Arizona to the United States. 2. 1864: The Arizona Territory is established. 3. 1877: The first railroad in Arizona is completed, connecting Tucson and Yuma. 4. 1881: The Gunfight at the O.K. Corral takes place in Tombstone, Arizona. 5. 1912: Arizona becomes the 48th state in the United States. 6. 1929: The first airmail fl...
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