South Dakota | Flag, Facts, Maps, & Points of Interest | Britannica

South Dakota, constituent state of the United States of America. South Dakota became the 40th state of the union on November 2, 1889. The state has two unique physical features: it contains the geographic centre of the United States, which is located just north of Belle Fourche, and it has its own continental divide, as a result of which Lake Traverse, in the southeastern corner of the state …

https://www.britannica.com/place/South-Dakota