1. In 1883, the South Dakota Agricultural College (now known as South Dakota State University) was founded in Brookings, South Dakota.

2. On January 15, 1927, the controversial film "Underworld" premiered in Sioux Falls, South Dakota. The film was banned in several cities for its portrayal of crime and the underworld.

3. In 1937, the South Dakota State Legislature declared the Pasque flower as the official state flower. The Pasque flower is a wildflower that blooms in the spring in the prairies of South Dakota.

4. On January 15, 1943, a B-17 bomber crashed near Deadwood, South Dakota, killing all 10 crew members. The crash site is now a popular hiking trail and memorial.

5. In 1971, the South Dakota state legislature approved a bill to lower the voting age from 21 to 18. The bill was later ratified by the 26th Amendment to the United States Constitution in 1971, which lowered the voting age nationwide.