1. On March 7, 1913, South Dakota ratified the 16th Amendment to the U.S. Constitution, which allows Congress to levy income taxes. This amendment helped to establish the progressive income tax system that is still in use today.

2. March 7, 1887 marks the founding of the South Dakota School of Mines & Technology in Rapid City. This public research university specializes in science, engineering, and technology, and has become a respected leader in these fields.

3. In 1956, the South Dakota State Capitol in Pierre was partially destroyed by a fire. Although several important historical documents were lost in the blaze, the structure itself was restored and remains an important symbol of South Dakota's government.

4. Pierre, South Dakota was officially designated as the state capital on March 7, 1890. Previously, the capital had been located in several different cities throughout the state, including Yankton, Sioux Falls, and Huron.

5. March 7, 1877 was the day that the Sioux people surrendered to U.S. forces under General George Crook at Fort Robinson, Nebraska. This event marked the end of the Sioux War and the start of a new era in South Dakota's history.