1. In 1863, a group of Dakota Indians attacked the settlement of Lake Shetek in southwestern Minnesota, killing 15 people and taking several others captive. This event was part of the larger conflict between the Dakota and the U.S. government known as the Dakota War of 1862.

2. In 1889, South Dakota became a state, joining North Dakota as the 39th and 40th states in the Union. The state's motto, "Under God, the People Rule," was adopted the following year.

3. In 1904, the famous Sioux Falls flood occurred, which caused two deaths and extensive property damage in the city. The flood was caused by massive amounts of rainfall and snowmelt, and led to significant changes in the city's infrastructure to prevent future disasters.

4. In 1962, the first nuclear missile silo in South Dakota was completed, as part of the Cold War's arms race between the United States and the Soviet Union. The silo, located near Wasta, was one of many across the state that housed Minuteman missiles capable of delivering nuclear payloads.

5. In 1999, the Crazy Horse Memorial in the Black Hills of South Dakota received a major donation from T. Denny Sanford, a philanthropist and businessman from Sioux Falls. The donation helped fund the construction of the Indian Museum of North America, as well as other educational and outreach programs related to the monument.