1. In 1872, the town of Deadwood was established. This town played a significant role in South Dakota's history as it was where the Gold Rush began in the Black Hills.

2. In 1904, South Dakota's first woman dentist, Dr. Mabel Lee, opened her practice in Vermillion. Dr. Lee was a trailblazer for women in the field of dentistry and went on to become a pioneer in orthodontics.

3. In 1949, the iconic Mount Rushmore National Memorial was officially dedicated. The monument features the faces of four American presidents – George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt – and has become a symbol of American history and culture.

4. In 1990, the town of Mitchell unveiled the world's only Corn Palace. The palace is a unique building that is decorated completely with corn and grains each year. The tradition began in 1892 as a way to promote the town's agricultural industry.

5. In 1998, South Dakota's first female governor, M. Michael Rounds, was inaugurated. Governor Rounds served as the state's governor from 2003 to 2011 and was known for his efforts to promote economic development and fiscal responsibility.