What was the main reason that early settlers gradually spread across the Americas?

Question

They were constantly under attack from neighboring tribes.
They often relocated to find more favorable farming conditions.
They traveled far and wide to trade their goods with other tribes.
They were nomadic hunters and had to keep moving in search of food.

Answer 1

The main reason that early settlers gradually spread across the Americas was that they were nomadic hunters and had to keep moving in search of food. This nomadic lifestyle necessitated the movement of groups in search of game and suitable foraging areas, which ultimately led to the gradual spread of populations across the continent.