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 Arizona’s history is a transition from ancient civilizations to Spanish and Mexican rule, and finally to its status as a critical U.S. battleground state in 2026. Pre-Columbian and Colonial Eras Indigenous Roots: For thousands of years, advanced cultures like the Hohokam, Ancestral Puebloans, and Mogollon thrived in the region, developing sophisticated irrigation systems still visible today. Spanish Exploration: In 1539, Marcos de Niza was the first European to explore the area. Spanish missionaries, most notably Father Eusebio Kino, established several missions in the late 1600s, including [San Xavier del Bac](https://sanxavier mission.org/) near Tucson. Mexican Rule: Arizona became part of Mexico in 1821 following its independence from Spain. During this time, the settled population remained small due to frequent conflicts with the Apache and Navajo tribes. U.S. Expansion and Territory Acquisition: Most of Arizona was ceded to the U.S. in 1848 after the Mexican-American War. The southern strip of the state was later acquired through the Gadsden Purchase in 1854 to facilitate a transcontinental railroad route. Territorial Status: Arizona was officially separated from the New Mexico Territory in 1863 during the Civil War. The capital moved several times—from Prescott to Tucson and back—before permanently settling in Phoenix in 1889. The 5 Cs: The territorial economy was built on "The 5 Cs": Copper, Cattle, Cotton, Citrus, and Climate. Statehood and Modern Growth 48th State: Arizona achieved statehood on February 14, 1912, becoming the last of the contiguous 48 states to join the Union. Post-War Boom: After World War II, the widespread use of air conditioning and the establishment of military bases led to a massive population boom. Political Shifts: Long a "red" stronghold, Arizona evolved into a high-profile "purple" battleground state by the early 2020s. Current Era (2026) 2026 Elections: As of January 2026, Arizona is preparing for highly competitive elections, including races for Governor, Attorney General, and all 90 state legislative seats. Ballot Measures: Three statewide measures are already certified for the November 3, 2026 ballot, covering topics such as vehicle tax prohibitions and municipal sales taxes on food. Sustainability Challenges: In 2026, the state continues to manage critical water scarcity issues linked to climate change and the low levels of the Colorado River.