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The Comanche
After arriving in the New World, the horse eventually made its way north and west, aided by migrating Spanish colonists and suddenly mobile Indian tribes. The animal changed Indian life irrevocably: now tribes could travel where they wanted, carry what they had, hunt what they needed, and make war more ferociously than before. The horse changed the Comanches more than any other tribe, making them lords of the Plains by the mid-18th century and some of the greatest horsemen who ever lived.

George Catlin, Comanche Feats of Horsemanship.