What item introduced to the Americas in the Columbian Exchange do you think was most important why?

One of the most important items introduced to the Americas during the Columbian Exchange was the horse. Horses revolutionized transportation, agriculture, and hunting for many Indigenous peoples, enhancing their mobility and altering their lifestyles significantly. This introduction facilitated trade and warfare, ultimately reshaping social and economic structures across the continent. The impact of horses on Indigenous cultures was profound, as they became integral to various societies, particularly in the Great Plains.