1. On June 1, 1889, the Dakota Territory was officially divided into two states to become North and South Dakota. This was a significant moment in South Dakota's history as it marked its statehood.

2. The renowned American journalist, Robert Nathan, was born in Yankton, South Dakota, on June 1, 1894. Nathan was a prolific writer and author of numerous novels and plays, including works such as "The Bishop's Mantle" and "One More Spring."

3. June 1, 1916, saw the establishment of the Wind Cave National Park in South Dakota, becoming the country's eighth national park. The Wind Cave is home to over 95% of the world's known boxwork formations and offers visitors various recreational opportunities.

4. On June 1, 2003, the city of Rapid City, South Dakota, experienced one of the worst hailstorms in its history. The hailstorm caused significant damage to homes, vehicles, and vegetation. It was recorded as one of the most expensive hailstorms in South Dakota, with an estimated cost of over $100 million.

5. The Indigenous people of South Dakota call themselves the 'Lakota.' On June 1, 1971, the United States government officially recognized the Cheyenne River Sioux Tribe, which is made up of the Lakota and Dakota people. This recognition granted the tribe significant autonomy, including rights to self-government and tribal sovereignty.