1. In 1876, on June 8, the Battle of Little Bighorn took place in Montana, which had a significant impact on the history of the Dakotas. Many Native American tribes, including the Sioux, Cheyenne, and Arapaho, had gathered to fight against US Army troops, resulting in a major victory for the Native Americans.

2. In 1909, on June 8, construction on the Oahe Dam began near Pierre, South Dakota. The dam, which was completed in 1962, created Lake Oahe, a large reservoir on the Missouri River that provides water for irrigation, hydroelectric power, and recreation.

3. In 1915, on June 8, the South Dakota state capitol building in Pierre was dedicated. The building was designed by architect Bertram Goodhue and is known for its distinctive Art Deco style and its prominent use of pink quartzite, a local stone.

4. In 1952, on June 8, the US Air Force began a project to build 200 missile silos in western South Dakota as part of the Cold War-era missile defense system. The construction of these silos had a significant impact on the local economy and land use, and some of them remain in use today.

5. In 2016, on June 8, a wildfire broke out in the Black Hills National Forest near Custer, South Dakota, which ultimately burned more than 83,000 acres and destroyed more than a dozen homes and structures. The fire was one of the largest in South Dakota history and had a significant impact on the local community and environment.