page_title: History of Arizona
section_title: Civil War
hierarchical_section_title: History of Arizona / American Arizona / Civil War
caption_attribution_description: A grain basket in the permanent collection of The Children’s Museum of Indianapolis.
context_page_description: The history of Arizona encompasses Spanish, Mexican, and American periods. Arizona was part of the state of Sonora, Mexico from 1822, but the settled population was small. In 1848, under the terms of the Mexican Cession the United States took possession of Arizona above the Gila River after the Mexican War, which became part of the Territory of New Mexico. By means of the Gadsden Purchase, the United States secured the northern part of the state of Sonora, which is now Arizona south of the Gila River in 1854.
  In 1863, Arizona was split off from the Territory of New Mexico to form the Arizona Territory. The remoteness of the region was eased by the arrival of railroads in 1880. Arizona became a state in 1912 but was primarily rural with an economy based on cattle, cotton, citrus, and copper. Dramatic growth came after 1945, as retirees who appreciated the warm weather and low costs emigrated from the northeast.
  Arizona was a part of northern Mexico in the 1840s. It was remote and poor and seldom had outside contacts. The Mexican population, based in Tucson, was a few hundred, in addition to a presidio garrison of about 100 soldiers. The mission was deactivated in 1828.
context_section_description: During the Civil War, on March 16, 1861, citizens in southern New Mexico Territory around Mesilla (now in New Mexico) and Tucson invited take-over by the Confederacy. They especially wanted restoration of mail service. These secessionists hoped that a Confederate Territory of Arizona (CSA) would take control, but in March 1862, Union troops from California captured the Confederate Territory of Arizona and returned it to the New Mexico Territory.
  The Battle of Picacho Pass, April 15, 1862, was a battle of the Civil War fought in the CSA and one of many battles to occur in Arizona during the war among three sides—Apaches, Confederates and Union forces. In 1863, the U.S. split up New Mexico along a north–south line to create the Arizona Territory. The first government officials to arrive established the territory capital in Prescott in 1864. The capital was later moved to Tucson, back to Prescott, and then to its final location in Phoenix in a series of controversial moves as different regions of the territory gained and lost political influence with the growth and development of the territory.
caption: This ornate grain basket by Akimel O'odham dates from the early 20th century, showing the Native American dimension to the state's culture
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