1. In 1867, the first issue of the Black Hills Pioneer was published in Deadwood, South Dakota. This newspaper served as a major source of news for the Black Hills region and helped spread information about the gold rush that later occurred in the area.

2. In 1885, the town of Custer was officially incorporated. Today, Custer is known for its proximity to popular tourist attractions such as Custer State Park and Mount Rushmore.

3. In 1941, the U.S. Army established the Rapid City Army Air Base in South Dakota as part of World War II efforts. The base is now known as Ellsworth Air Force Base and is home to the B-1B Lancer bomber and other military aircraft.

4. In 1973, the American Indian Movement took over the town of Wounded Knee on the Pine Ridge Indian Reservation in South Dakota. The 71-day occupation was a protest against the federal government's treatment of Native Americans and ended after negotiations with government officials.

5. In 2002, South Dakota became the first state to legalize live poker games on the internet. The move was seen as a way to generate revenue for the state and has since been followed by other states legalizing online poker.