1. Statehood: March 19 marks an important day in South Dakota history as it is the anniversary of the state's admission to the Union on March 19, 1889. South Dakota became the 40th state of the United States.

2. Women's Suffrage: South Dakota was also the first state to allow women the right to vote in all elections, including presidential elections, in 1918. This made South Dakota a pioneering state for women's suffrage.

3. Military: The South Dakota National Guard was founded on March 19, 1862. The National Guard has played a critical role in the defense of the United States and has been deployed overseas on multiple occasions.

4. Tourism: The Black Hills Passion Play, a popular tourist attraction, started its first season on March 19, 1938. The play depicts the life of Jesus Christ and attracts thousands of visitors every year.

5. Agriculture: South Dakota has a rich agricultural history, and March 19 marks the birth date of Rosa Kiehn, an agricultural educator who worked tirelessly to promote farming practices in the state. Kiehn's contributions to the agricultural industry in South Dakota were significant, and she remains an important figure in the state's history.