Plains Indians are the Native Americans or First Nations who lived on the plains and rolling hills of the Great Plains of North America. Their equestrian culture and resistance to domination by Canada and the Midwestern United States have made the Plains Indians an archetype in literature and art for American Indians everywhere. Plains Indians are usually divided into two broad classifications which overlap to some degree. The first group became fully nomadic and dependent upon the horse during the 18th and 19th centuries, following the vast herds of buffalo, although some tribes occasionally engaged in agriculture; growing tobacco and corn primarily. These include the Blackfoot, Arapaho, Assiniboine, Cheyenne, Comanche, Crow, Gros Ventre, Kiowa, Lakota, Lipan, Plains Apache (or Kiowa Apache), Plains Cree, Plains Ojibwe, Sarsi, Nakoda (Stoney), and Tonkawa.