National Arizona Day is observed worldwide on February 14, celebrating Arizona's admission as the 48th state of the United States in 1912. This day commemorates Arizona Statehood Day, which marks the anniversary of the state's entry into the Union. Although not a public holiday, it is recognized with events and programs that focus on Arizona's rich history and culture. The day also highlights the state's indigenous heritage, including notable Native American cultures such as the Hohokam and Mogollon. An alternative celebration, also known as National Arizona Day, takes place on June 21, created in 2017 by National Day Calendar as part of its National State Days project.