1. In 1792, a battle occurred between the Sioux and the Arikara near present-day Pierre, South Dakota. The Arikara were defeated, and the Sioux took control of the area.

2. In 1879, the first bank in the Dakota Territories, the Dakota National Bank, was established in Yankton, South Dakota.

3. In 1934, the Cheyenne River Indian Reservation was established in western South Dakota.

4. In 1980, the Mount Rushmore National Memorial underwent a major restoration project, which included cleaning the faces of the presidents and repairing cracks and fissures in the rock.

5. In 2011, the Missouri River flooded, causing widespread damage in several states, including South Dakota. Many residents were forced to evacuate their homes, and several communities along the river were severely impacted.