1. In 1862, the Dakota War broke out in Minnesota, and many Dakota people fled to South Dakota to seek refuge from the conflict. This led to tension and violence between Native communities and settlers in South Dakota during August of that year.

2. On August 13, 1918, the Spanish flu pandemic arrived in South Dakota, causing widespread illness and death throughout the state.

3. In August 1890, the infamous Wounded Knee Massacre occurred in South Dakota, in which U.S. soldiers killed more than 250 unarmed Lakota men, women, and children.

4. On August 13, 1961, construction of the controversial Gavins Point Dam began on the Missouri River in South Dakota. The dam has had a significant impact on the region's environment and economy.

5. August 13, 1979 saw the release of "The Black Hills: A Case Study in Natural Resources" by the U.S. General Accounting Office. The report discussed the ongoing controversy over the federal government's ownership and management of the Black Hills, which are considered sacred by many Native American tribes.