Arizona : State History Dates
August 18, 1775 - Fort Tucson was first established.
February 2, 1848 - The Treaty of Guadalupe Hidalgo was signed, putting an end to the Mexican-American War. The U.S. received land that included parts of Arizona and several other states.
December 30, 1853 - The Gadsden Purchase was signed which gave the lower part of Arizona to the U.S.
November 17, 1856 - Fort Buchanan in southern Arizona was established.
February 24, 1863 - The Territory of Arizona was established.
February 25, 1881 - The city of Phoenix was incorporated.
October 26, 1881 - The legendary Gunfight at the O.K. Corral occurred in Tombstone, Arizona. Wyatt Earp, with his brothers Morgan and Virgil, and his friend Doc Holliday took part.
September 4, 1886 - The fighting with Native Americans ended when Geronimo, Chief of the Apaches, surrendered.
March 18, 1911 - Former President Theodore Roosevelt was on hand to dedicate the Roosevelt Dam. The dam, which was first started on March 13, 1903 would become a National Historic Landmark on May 23, 1963.
February 14, 1912 - Arizona officially became the 48th U.S. state. Phoenix became the state’s capital.
February 26, 1919 - The Grand Canyon officially became a National Park.
February 18, 1930 - Pluto (the former planet) was discovered by Clyde Tombaugh while he was at the Lowell Observatory in Flagstaff, Arizona.
March 4, 1930 - Former President Calvin Coolidge was on hand to dedicate the Coolidge Dam.
March 1, 1936 - Construction on the Hoover Dam was completed.
September 25, 1981 - Arizona native, Sandra Day O’Connor became the first woman to be sworn in as a Justice on the U.S. Supreme Court.
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