The horse played an important role in the lives of Aboriginals living on the great plains. Introduced into North America by the Spanish conquistadors, horses began migrating upward from the southwestern states in the early eighteenth century. The horse transformed the lives of the Plains Indians. Not only did horses provide transportation, but they also enabled the tribespeople to haul heavy loads, hunt buffalo and go to war. Before the horse, Plains Indians used dogs to carry loads or drag the travois ― a frame made from two wooden poles and a platform, which was later replaced by the cart.