<human>:  When did the Wounded Knee Massacre happen?
<bot>: The Wounded Knee Massacre happened on December 29, 1890. It was the largest massacre of Native Americans in American history. The massacre occurred when the U.S. Army attacked a peaceful camp of Lakota Sioux Indians. The army killed 300 people, including women and children, and wounded more than 300 more. The U.S. government has never apologized for the massacre.