1. On September 6, 1872, the first South Dakota Agricultural College (now South Dakota State University) opened its doors in Brookings. The college was founded under the Morrill Land-Grant Acts, which aimed to provide funding and land for colleges focusing on agriculture, science, and engineering.

2. In 1889, on September 6, South Dakota was admitted to the United States as the 40th state. The state had been part of the Dakota Territory until it was split into North and South Dakota.

3. On September 6, 1941, the South Dakota National Guard was federalized for World War II. The Guard played a significant role in the war effort, with soldiers from South Dakota serving in Europe, Africa, and the Pacific.

4. South Dakota has a rich Native American history, and on September 6, 1980, the Indian Child Welfare Act was passed to help preserve indigenous families and culture. The act aims to prevent the separation of Native American children from their families and communities, and provides guidelines for their placement in foster or adoptive homes.

5. On September 6, 2015, the first-ever NFL game was held in South Dakota, when the Minnesota Vikings played the Pittsburgh Steelers in the inaugural game at the new U.S. Bank Stadium in Minneapolis. The game was played in Sioux Falls and was broadcast statewide.