1. The first woman mayor in South Dakota took office on June 4, 1918.

On June 4, 1918, the first woman mayor in South Dakota, Lydia Dickson, was sworn into office in Huron. She served as mayor for two years and was a prominent figure in women's suffrage movements. Her election as mayor was seen as a major step forward for women in politics in South Dakota and across the country.

2. A major tornado outbreak occurred on June 4, 1983.

On June 4, 1983, a major outbreak of tornados struck South Dakota, Nebraska, Iowa, and Minnesota. The outbreak produced 48 confirmed tornados in South Dakota alone, leading to extensive destruction and several deaths. The outbreak is still considered one of the most significant in the history of the region.

3. The state's first agricultural experiment station was established on June 4, 1887.

On June 4, 1887, the first agricultural experiment station in South Dakota was established at the Dakota Agricultural College in Brookings. The station was established to conduct research and experimentation in agriculture and provide farmers with new techniques for improving crop yields and livestock health.

4. The first public radio station in South Dakota went on the air on June 4, 1951.

On June 4, 1951, the first public radio station in South Dakota, KUSD-FM, went on the air in Vermillion. The station was part of the University of South Dakota, and its launch marked a significant step forward for public broadcasting in the state.

5. The Pine Ridge Indian Reservation was established on June 4, 1889.

On June 4, 1889, the Pine Ridge Indian Reservation was established in southwestern South Dakota. The reservation was created after the forced relocation of the Oglala Lakota tribe from their ancestral lands to the Pine Ridge area. The reservation remains an important center of Lakota culture and history in South Dakota.