Arizona History & Heritage Guide 2025

First humans reach what is now Arizona, hunting mammoths and giant ground sloths across a greener, wetter landscape.

The Hohokam people develop the most sophisticated prehistoric irrigation system in North America, with over 500 miles of canals under present-day Phoenix. They build platform mounds, ball courts, and trade across the Southwest.

The Ancestral Puebloans (formerly called Anasazi) construct remarkable stone communities including cliff dwellings at Canyon de Chelly and Betatakin. They eventually migrate south and become the ancestors of today's Pueblo peoples.

The Sinagua ('without water' in Spanish) build cliff dwellings including Montezuma Castle, Tuzigoot, and Wupatki, demonstrating sophisticated dry farming techniques in the Verde Valley.

Friar Marcos de Niza leads the first Spanish expedition into Arizona searching for the Seven Cities of Cibola (Gold). Francisco Vásquez de Coronado follows in 1540-1542 on a massive expedition reaching as far as Kansas.

Jesuit priest Eusebio Francisco Kino begins establishing a chain of missions in southern Arizona, including the predecessor to San Xavier del Bac near Tucson — still active today as a Tohono O'odham parish.

Spain establishes the Presidio San Agustín del Tucson as a military garrison to defend against Apache raids, making Tucson Arizona's oldest European settlement.

Arizona becomes part of the newly independent Republic of Mexico following Mexican independence from Spain.

Following the Mexican-American War, the northern part of Arizona (north of the Gila River) is ceded to the United States.

The US purchases the southern strip of Arizona (including Tucson and the Sonoran Desert) from Mexico for $10 million, completing the current Arizona territory boundary.

President Lincoln signs legislation creating the Arizona Territory, separated from New Mexico Territory, with Prescott as the capital.

Prolonged conflict between the US Army and Apache tribes under leaders including Cochise and Geronimo resisting forced relocation. Fort Apache and Fort Bowie serve as military bases.

Ed Schieffelin discovers silver near what becomes Tombstone, triggering a massive mining boom and population explosion in southeastern Arizona.

The legendary 30-second confrontation between the Earp brothers and Doc Holliday against the Clanton-McLaury outlaw faction in Tombstone — the most famous gunfight in American frontier history.

Apache leader Geronimo surrenders to General Nelson Miles at Skeleton Canyon, ending the last major Native American resistance in the continental United States.

Construction of Roosevelt Dam on the Salt River begins, creating the infrastructure that will allow Phoenix to grow from a small frontier town into a major American city.

Arizona becomes the 48th and last contiguous state admitted to the Union on February 14, 1912 (Valentine's Day). Phoenix is established as the state capital.

Arizona hosts Japanese American internment camps (Poston and Gila River), major military training bases, and becomes a center for aircraft manufacturing. The mild climate and open spaces make it ideal for training thousands of pilots.

The Federal Highway Act and resulting interstate system connects Arizona to national markets, accelerating postwar growth in Phoenix and Tucson.

Air conditioning, retirement communities (Sun City founded 1960), and the high-tech corridor (Intel, Motorola) drive Arizona's transformation from a frontier state to one of America's fastest-growing regions.

Frank Lloyd Wright's Scottsdale desert complex joins the UNESCO World Heritage list as part of the Frank Lloyd Wright American Architecture collection.