As settlers came west, they discovered there were already people living on this "new" land. Discover how this mass invasion of settlers impacted the indigenous peoples of the West: their first contacts with explorers such as Lewis and Clark; the gradual encroachment of white settlers on their traditional lands; the enforced removal of native peoples to the West; the clashes with native peoples after the Civil War; resistance by native leaders such as Sitting Bull; and the end of Native American resistance in the 1890s.