1. In 1873, the town of Yankton was officially incorporated in South Dakota. Yankton has a rich history as one of the first settlements in the Dakotas, and played a significant role in the early development of the region.

2. In 1913, South Dakota Governor Frank Byrne signed a bill outlawing the sale, manufacture, and transportation of alcohol within the state. This was several years before the national prohibition on alcohol, which was put into effect in 1920.

3. In 1945, South Dakota Army Airfield (now Ellsworth Air Force Base) was officially dedicated near Rapid City. The base played a key role in strategic bombing operations during the Cold War, and continues to be an important military installation today.

4. In 1971, the town of Murdo was hit by a massive tornado that caused extensive damage and killed several people. The storm was part of a larger outbreak of tornadoes that swept across the central United States that day.

5. In 2015, two American Indian tribes in South Dakota filed a lawsuit against the state, arguing that their approval was needed for the construction of the Keystone XL oil pipeline. The case remains ongoing, and has become a flashpoint in the debate over environmental and cultural impacts of resource extraction on Native lands.