1) In 1876, Lakota Sioux and Cheyenne warriors defeated General George Crook's army at the Battle of the Rosebud in southern Montana. This was a significant prelude to the famous Battle of Little Bighorn which occurred just 8 days later.

2) On June 18, 1925, Ada and Minna Everleigh, two well-known madams from Chicago, were arrested in Sioux Falls for running a prostitution ring out of the Cataract Hotel. The case received national attention and highlighted the issue of sex trafficking in the Midwest.

3) In 1934, President Franklin D. Roosevelt signed the Indian Reorganization Act (IRA) which provided Native American tribes with greater self-governance and control over their land. This legislation had a profound impact on South Dakota's reservations and helped to preserve traditional cultures and customs.

4) On June 18, 1965, the Black Hills Flood devastated the town of Rapid City, killing 238 people and causing over $160 million in damage (in 2021 dollars). The flood was caused by a sudden thunderstorm that dumped over 10 inches of rain in just a few hours, causing massive mudslides and flooding.

5) In 1986, the state of South Dakota passed a law allowing casinos to operate on Native American reservations. The move was controversial at the time, but has since become a major industry in the state, contributing millions of dollars each year to tribal communities and the South Dakota economy as a whole.