What are the changes that horses brought to american indians?

Answer 1

For one aspect, the horse brought a short, squat Indian Nation to become the Cossacks of the American West--the Comanche. Their abilities on horseback are legend and they were the nation to have perfected the side-riding in combat, having only a foot heel showing.

Answer 2

Horses allowed a much greater mobility to Native American tribes. This allowed them to hunt and war over much larger areas and allowed the flourishing of the Northern Plains buffalo hunting cultures.