17. Then Gold Was Discovered in South Dakota
When gold was discovered, the US government decided to ignore the treaties that it had made with the native tribes there. A group of Sioux and Cheyenne people was so incensed that they left their reservations to join the leaders Sitting Bull and Crazy Horse, who were encamped along the Little Bighorn River. They defied the US War Department and risked an open attack from the military.