Arizona was the last of the continental forty-eight states to become a state.
Before statehood, the Arizona Territory was the western half of the New Mexico Territory.
Arizona was originally going to be a part of New Mexico rather then its own state.
Arizona is part of the Mexican Cession, land obtained by the United States following the Mexican-American War, along with California, New Mexico, Nevada, and Utah. Along with parts of Western Colorado and Southwestern Wyoming.