The early americans were nomads who depends on

America was inhabited by humans long before the first European set foot on the continent. The beginning of civilization in America occurred during the last Ice Age when the nomadic, ancestral peoples of the Americas—the Paleo-Indians—migrated into the current-day continental United States and Canada. Their exact origins, as well as the route and timing of their migrations, are the subject of much scholarly discussion.

explanation:

cause they can