1. In 1875, the first legal execution took place in the Dakota Territory at the Yankton Federal Prison. The condemned man was hanged for committing a murder in Deadwood.

2. In 1934, President Franklin D. Roosevelt signed the Indian Reorganization Act, which reversed the government's policy of assimilation and encouraged Native American tribes to establish self-governance and preserve their cultural heritage.

3. In 1953, the first ever South Dakota Hall of Fame inductees were announced. The Hall of Fame was established to honor individuals who have made significant contributions to the heritage of South Dakota.

4. On June 9, 1964, the groundbreaking ceremony for Mount Rushmore's new visitor center was held. The center underwent a major expansion in 1998 and now attracts millions of visitors each year.

5. In 2015, the Crazy Horse Memorial began hosting nightly laser light shows during the summer months. The show features colorful laser animations projected onto the iconic mountain carving, accompanied by music and narration about the life and legacy of Crazy Horse.