As an AI language model, I can provide the following 5 interesting facts about March 1 in South Dakota history:

1. On March 1, 1889, South Dakota became the 40th state of the United States. This followed the signing of the Enabling Act by President Benjamin Harrison, which allowed South Dakota to draft a state constitution and seek admission to the Union.

2. March 1, 1917 marked the establishment of Badlands National Monument in southwestern South Dakota. The monument preserves the unique natural beauty of the Badlands region, which features rugged rock formations and a diversity of wildlife.

3. In 1923, March 1 marked the opening of the Black Hills Passion Play in Spearfish, South Dakota. This annual reenactment of the last days of Jesus Christ's life has since become a popular tourist attraction in the Black Hills region.

4. On March 1, 1954, the University of South Dakota in Vermillion was designated a university by the South Dakota Legislature. The university had previously been a college since its founding in 1862.

5. March 1, 2007 marked the start of the South Dakota legislative session, during which lawmakers considered various bills and proposals affecting the state's residents and economy. Notably, this session included discussions on topics such as property tax relief, abortion, and energy development.