1. On September 21, 1892, the first issue of the Woonsocket News was published. This newspaper has been in continuous publication ever since and is still a vital source of information in South Dakota today.

2. On this day in 1922, the historic Corn Palace in Mitchell was destroyed by a fire. However, it was quickly rebuilt and remains a popular tourist attraction in the state.

3. In 1993, September 21 became an important day in South Dakota history because it was the day that the United States Senate officially apologized for the Wounded Knee Massacre. This incident, which took place in 1890, led to the deaths of over 250 Lakota Sioux people.

4. On this day in 2015, the Crazy Horse Memorial in the Black Hills unveiled a new laser light show that depicts the story of the Native American hero. This attraction has become one of the most popular in the state.

5. September 21, 2000, was the day that the South Dakota Discovery Center and Aquarium opened its doors to the public for the first time. This center offers hands-on exhibits and educational programs to help visitors learn about the natural world and the environment.