1. The Battle of Little Bighorn: On June 7, 1876, the Battle of Little Bighorn took place in Montana, not far from the South Dakota border. The conflict between General George Custer and Sioux and Cheyenne warriors resulted in the death of Custer and nearly 300 of his men, making it one of the most significant battles in U.S. history.

2. Statehood: June 7, 1887, is the date that South Dakota officially became a state. This event marked the end of a long struggle for statehood, which was delayed due to political disagreements and concerns over the balance of power in Congress.

3. Jewel Cave National Monument: On June 7, 1908, President Theodore Roosevelt declared Jewel Cave a National Monument, making it the second-largest cave system in the U.S. The cave is located in the Black Hills region of South Dakota and is known for its unique formations and underground lakes.

4. Huron Tornado: On June 7, 1993, a massive tornado struck the town of Huron, South Dakota, causing extensive damage and injuries. The tornado was one of the largest and deadliest in the state's history, with winds exceeding 200 mph.

5. First Female Governor: On June 7, 2003, Governor Mike Rounds announced that he had chosen Lt. Governor Dennis Daugaard as running mate for his reelection campaign. The announcement marked the first time a female governor, M. Michael Rounds, had run for reelection in South Dakota.