National Arizona Day recognizes the state that joined 48 states into a contiguous unit. Interestingly, Arizona became a state on Valentine’s Day in 1912. Arizona is home to the oldest continuously inhabited settlement in North America. The Grand Canyon State, Arizona brings the wilderness to you & remarkable landscapes. Saguaro National Park, the mighty Saguaro cacti of the west. Great Basin, Chihuahua, Mojave & Sonoran deserts are found in Arizona.