1) In 1890, the last major conflict between Native American tribes and the US Army took place at Wounded Knee Creek. The tragic event resulted in the death of over 150 Sioux men, women, and children.

2) In 1917, the deadliest train derailment in South Dakota occurred near the town of Gascoyne. The accident, caused by a broken axle, killed 37 and injured dozens of others.

3) On December 28, 1931, the historic Mount Rushmore National Memorial was formally dedicated. The monument features massive sculptures of four US presidents: George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt.

4) In 1965, a severe blizzard known as the "Storm of the Century" struck South Dakota and surrounding states. The storm, which lasted for several days, caused widespread power outages, destroyed homes and buildings, and claimed dozens of lives.

5) In 1992, the United States Mint released a commemorative coin featuring the image of Crazy Horse, a respected Lakota warrior and leader. The coin was authorized by Congress to honor the contributions of Native American tribes to American history and culture.