1. The Battle of Wounded Knee Massacre occurred on November 20, 1890, in South Dakota. It marked the end of the Indian Wars and is considered one of the deadliest conflicts between Native Americans and the US government. Over 200 Lakota Sioux were killed, including women and children.

2. On November 20, 1943, the South Dakota Corn Palace was dedicated in Mitchell, South Dakota. The palace is a unique tourist attraction that features murals made entirely out of corn kernels. It has been a popular destination for over a century.

3. November 20, 1907, was the date of the founding of the South Dakota School of Mines and Technology in Rapid City. The school specializes in engineering, science, and technology and is known for its high-quality education, research, and innovation.

4. On November 20, 1925, South Dakota Governor William McMaster signed into law a bill that made bison the official state animal. Bison were almost extinct in the late 1800s, but conservation efforts have helped their population grow in recent years.

5. South Dakota's first-ever live radio broadcast took place on November 20, 1922. The broadcast was made from the Black Hills area near Deadwood and was heard by listeners 70 miles away in Rapid City. This event marked the beginning of a new era in communication for the state of South Dakota.