The term NEB. TRIBE refers to the Omaha tribe, a Native American tribe that is part of the Siouan language group. The Omaha tribe is located in the Midwestern United States, primarily in Nebraska and Iowa. The Omaha tribe is also known as the Omaha Nation or Omaha People. The Omaha tribe is composed of two distinct groups: the Omaha and the Omahas. The Omaha are the original inhabitants of the area, while the Omahas are descendants of the Omaha who migrated to the area in the late 19th century.