1. South Dakota was officially admitted as the 40th state of the United States on January 26, 1889. The state had been part of the Dakota Territory before achieving statehood.

2. In 2002, January 26 was officially designated as "American Indian Day" in South Dakota. This day honors the unique cultural heritage and contributions of Native American peoples to the state and the country.

3. On January 26, 1972, a massive blizzard struck the state, dumping over two feet of snow in some places and causing widespread power outages and transportation disruptions. The blizzard is still remembered as one of the worst in South Dakota's history.

4. January 26, 1987 marked the launch of the "Mt. Rushmore Express" train service, which offered tourists a scenic journey from Hill City to Keystone with views of the iconic monument. The service continued until 2009, when it was discontinued due to financial difficulties.

5. In 2017, thousands of people gathered in Rapid City on January 26 to protest the construction of the Dakota Access Pipeline. The protest was part of the larger movement against the pipeline and its potential impact on Indigenous lands and water resources.