A group of related North American Indian peoples living mostly in the Plains and speaking related langauges within the Siouan language stock. They comprise the Dakota-speaking Santee (Eastern Sioux), the Nakota-speaking Yankton, and the Lakota-speaking Teton (Western Sioux), each of which in turn has lesser divisions (e.g., Blackfoot, Oglala). The name Sioux is a French derivation of an Ojibwa name for enemy or snake. Before the 17th century the various groups of Sioux had lived in present Minnesota and around Lake Superior; conflict related to the fur trade displaced them to the Plains. There they adopted a nomadic way of life, hunting buffalo, living in tepees, emphasizing valour in warfare, and practicing the sun dance. The Sioux fought American incursions into their territory in 1862 and again in the 1860s and '70s. Sioux resistance to American colonialism culminated in the Battle of the Little Bighorn in 1876, a great indigenous victory. However, economic pressure eventually caused most Sioux to surrender and move to reservations, where many adopted the Ghost Dance religion. In 1890 the U.S. Seventh Cavalry massacred Sioux civilians at Wounded Knee, also the location of an occupation by the American Indian Movement in 1973. The Sioux numbered about 160,000 in the early 21st century. See alsoSitting Bull.