Oklahoma's statehood was the culmination of decades-long efforts by native tribes, settlers, and politicians. Indian Territory, inhabited by the Five Civilized Tribes (Cherokee, Chickasaw, Choctaw, Creek, and Seminole), joined Oklahoma Territory, home to settlers and pioneers, to form the 46th U.S. state. With Congress's approval, Oklahoma's constitution was ratified, and Charles Haskell was inaugurated as the state's first governor. This union signified a new chapter in American history, blending Native American and American cultures.