Something occured to me the other day - how would the history of the world have been different if the Native American tribes, instead of hunting mammoths and mastadons to extinction, had instead domesticated them in a fashion similar to how Indians (the OTHER Indians) domesticated the Indian Elephants? As we all know, Elephants were responsible for many of Alexander the Great's defeats in India. And mounts, such as horseback, have traditionally granted great development and military advantages to every culture who employed them, pre-automobile. Would the Native Americans have lost that much ground to European invaders if they were riding atop gigantic pachyderms, and had used their potential strength and mobility to increase their food and shelter production far past what they actually did?