1. In 1885, the first train arrived in Rapid City, South Dakota, marking a major milestone in the development of the city and the region as a whole.

2. In 1898, the first issue of the Black Hills Pioneer newspaper was published in Deadwood, South Dakota. The newspaper went on to become one of the most influential in the region.

3. In 1929, the iconic Mount Rushmore National Memorial was dedicated in a ceremony attended by thousands of people, including President Calvin Coolidge.

4. In 1961, the South Dakota School of Mines and Technology awarded its first doctoral degree, a major achievement for the state and the university.

5. In 1980, the largest earthquake ever recorded in South Dakota occurred, registering a magnitude of 4.4 on the Richter scale. The quake caused no major damage, but was felt throughout the region.