From what I know, boxing or pugilism as it was called was brought to what is now the U.S.A. by the white man when he settled here from Europe. Fist fighting has a history that goes back to the middle ages, the knights used it as a form of combat, and before then it has roots that go all the way back to ancient Greece. The american indians did have certain unarmed fighting styles but they were mostly just grappling systems, they didn't use much striking or if they did strike it would be done with a weapon such as a tomahawk or club.