1. In 1893, the Black Hills Mining Association was founded in Lead, South Dakota. The association was formed by local businessmen and miners to promote the mining industry in the area and to lobby for favorable mining regulations.

2. On September 13, 1919, the first state fair was held in Huron, South Dakota. The event featured livestock exhibitions, horse races, agricultural displays, and carnival rides. The state fair has been held annually ever since and is one of the largest events in the state.

3. In 1953, the Oahe Dam was dedicated by President Dwight D. Eisenhower. The dam, located on the Missouri River near Pierre, South Dakota, is one of the largest earth dams in the world and was built to provide flood control, hydroelectric power, and irrigation to the region.

4. On September 13, 1969, South Dakota State University defeated the University of South Dakota 29-0 in the first-ever game played at the new Coughlin-Alumni Stadium in Brookings, South Dakota. The stadium has since been expanded and is now named Dana J. Dykhouse Stadium.

5. In 1999, the Crazy Horse Memorial in the Black Hills of South Dakota received a $10 million donation from philanthropist T. Denny Sanford. The memorial, which has been under construction for over 70 years, is a tribute to the Lakota warrior Crazy Horse and is expected to be the largest mountain carving in the world once completed.