The original inhabitants of the Plains region of North America. Traditionally, there were two main groups, sedentary farmers and nomadic hunters. The introduction of the horse in the early 18th century had a profound effect, with many peoples, such as the Sioux and the Cree, moving into the Plains area. These equestrian nomads became adept buffalo hunters. During the winter months, the tribes split into small groups. In many tribes, like the Iroquois, women had a high status. Among men rank was not inherited but had to be achieved through warfare, as well as through generosity towards widows and orphans. The title of chief was largely a matter of prestige, as authority was exercised by the consensus of those of high status, who would act as arbiters in dispute resolution.