America was never populated because America was cold back then and never had a land bridge. I think this because since then the ice age hasn’t begun and never was it cold enough to make a land bridge from Asia to America. During this time the were originated from Asia and Africa. These were the main early human civilization back then. Also if they wanted to go to America they would need a land bridge or a boat. They somehow made it to America. This occurred the ice age began and ice started to form. Soon a corridor would form and the people went in there until they made it to both North and South America.
