1. Statehood Day: December 1 marks Statehood Day for South Dakota, as it was on this day in 1889 that the state was officially admitted to the Union as the 40th state.

2. Badlands National Park Established: On December 1, 1978, the Badlands National Park was established in South Dakota. The park spans over 244,000 acres and is known for its unique rock formations and prairie lands.

3. Blizzard of 1880: On December 1, 1880, South Dakota was hit by one of the worst blizzards in its history. The storm lasted for three days and claimed the lives of over 200 people.

4. Deadwood's First City Council: On December 1, 1876, Deadwood held its first city council meeting. This was just months after the town had become famous for the discovery of gold in the Black Hills.

5. Great Flood of 1952: On December 1, 1952, Rapid City and the surrounding areas experienced a devastating flood that claimed 238 lives and caused millions of dollars in damages. The flood was caused by a sudden and heavy rainstorm that overwhelmed the city's drainage system.