1. Statehood Day: March 3, 1889, marks the day when South Dakota was officially declared a state. This day is also known as Statehood Day and is celebrated every year to commemorate the state's admission to the Union.

2. Major Floods: In 1965, the Big Sioux River in South Dakota flooded, causing significant damage to the cities of Sioux Falls and Dell Rapids. The flood was so severe that it caused the evacuation of over 2,500 people from their homes.

3. Famous Births: Several notable figures were born on March 3 in South Dakota history, including actress and singer Patricia Wettig, musician Neal McCoy, and former NFL player Paul Krause.

4. Tragic Fire: A devastating fire broke out in the city of Deadwood on March 3, 1879, destroying a large part of the city. The fire spread quickly and destroyed numerous buildings, leaving several hundred people homeless.

5. Military History: During World War II, South Dakota played an important role in training military personnel. Several military bases were established in the state, including the Rapid City Army Air Base and the Sioux Falls Army Air Field, which trained pilots for the war effort.