South Dakota became the fortieth state of the United States on November 2, 1889. Located in the northern Great Plains, the state is known for its rolling prairies, the Black Hills, and landmarks like Mount Rushmore and Badlands National Park. Its capital is Pierre, and the largest city is Sioux Falls. South Dakota's economy is based on agriculture, tourism, and manufacturing. The state has a rich Native American heritage, particularly of the Sioux Nation, and a history shaped by westward expansion and frontier life.