1. Statehood Day: February 14th marks South Dakota Statehood Day, the day in 1889 when South Dakota was admitted as the 40th state in the United States.

2. Mount Rushmore Creation: On February 14, 1927, sculptor Gutzon Borglum began work on his masterpiece - the Mount Rushmore National Memorial. The project took 14 years to complete and involved carving the faces of four American presidents - George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln.

3. Blizzard of 1897: On Valentine's Day in 1897, South Dakota experienced a major blizzard that resulted in widespread devastation and loss of life. The storm, which lasted for three days, caused a total of 16 deaths and more than $5 million in damage.

4. Black Hills Gold Rush: On February 14th, 1876, a group of miners discovered gold in the Black Hills of South Dakota, leading to one of the most significant gold rushes in the United States. The discovery sparked a frenzy of mining activity in the region, leading to the formation of several towns and the establishment of the mining industry in South Dakota.

5. The Great Sioux War: On February 14, 1876, a group of Sioux warriors attacked a surveying party led by Colonel William Fetterman, leading to the start of the Great Sioux War. The war, which lasted for two years, was fought between the Sioux and Northern Cheyenne tribes against the United States government and resulted in the adoption of the Indian Appropriations Act.