A few days after Christmas 1890, U.S. cavalry troops surrounded and fired on a band of Lakota Sioux near Wounded Knee Creek, South Dakota. The Indians had already surrendered, but when someone fired a shot while the band was being disarmed, chaos broke out. No one knows for sure who fired that first shot, but in the end nearly 300 Lakota lay dead. The massacre at Wounded Knee marked the final conflict between the Sioux and the U.S. Army. How would it affect the lives of the Lakota and change the United States?