1. South Dakota became a state on March 14, 1889. This was the same day as North Dakota. The two states were admitted to the Union simultaneously as the 39th and 40th states.

2. On March 14, 1952, the world's first successful artificial heart surgery was performed by South Dakota native Dr. Floyd John Lewis. The patient, a 41-year-old man, survived for 64 hours before passing away due to complications unrelated to the heart surgery.

3. On March 14, 1990, South Dakota Governor George Mickelson declared a state of emergency due to a severe blizzard that hit the state. The storm caused widespread power outages and transportation disruptions, resulting in several deaths.

4. March 14, 2017, marked the 130th anniversary of the founding of the town of Deadwood, South Dakota. The town was originally established in 1876 and became famous for its role in the gold rush of the Black Hills.

5. On March 14, 1960, the U.S. Army Corps of Engineers completed construction of the Oahe Dam on the Missouri River in South Dakota. The dam is one of the largest in the country and provides hydroelectric power and flood control for the region.