This document summarizes conflicts between settlers and Plains Indians in the American West. As settlers moved onto lands inhabited by tribes like the Sioux, conflicts arose over land and resources. The government attempted to resolve tensions through treaties establishing reservations, but these agreements were often broken. Notable conflicts included the Sioux victory over Custer at the Battle of Little Big Horn and the Wounded Knee Massacre. Ultimately, Plains tribes were confined to reservations as settlers continued westward expansion.