1. In 1877, the first Black Hills Fair was held in Rapid City. The fair featured agricultural exhibits, horse races, and other entertainment.

2. On September 14, 1927, the South Dakota Highway Patrol was established to promote safety on the state's highways. The patrol originally consisted of six officers and was tasked with enforcing traffic laws and helping stranded motorists.

3. In 1971, the Crazy Horse Memorial was dedicated near Custer, South Dakota. The massive sculpture, which depicts the Lakota warrior Crazy Horse on horseback, is still under construction and is projected to be the world's largest mountain carving once completed.

4. On September 14, 1992, the Missouri River Basin underwent major flooding, causing millions of dollars in damage to homes, businesses, and farmland. The flooding was caused by heavy rain and snowmelt, and led to the evacuation of thousands of people.

5. In 2013, the Sanford Underground Research Facility was formally dedicated in Lead, South Dakota. The facility, which is located in an old gold mine, is home to a number of scientific experiments, including studies of dark matter and neutrinos.