1. The Treaty of Fort Laramie was signed on July 30, 1868, which ended Red Cloud's War and granted the Sioux Indians designated reservation land in the Black Hills region of South Dakota.
2. The construction of Mount Rushmore was completed on July 30, 1941, after 14 years of work by sculptor Gutzon Borglum and his team.
3. The Homestake Mine in Lead, South Dakota, produced its first ounce of gold on July 30, 1876, and went on to become the largest and deepest gold mine in North America.
4. On July 30, 1975, the Oglala Sioux Civil Rights Organization drafted a declaration of war against the United States government, citing violations of the 1868 treaty and demanding their rights to self-determination.
5. The Yankton Sioux Tribe established the Fort Randall Casino on their reservation in Pickstown, South Dakota, on July 30, 1993, becoming the first Native American tribe in the state to operate a casino.