Actually, I thinkthe native americans would have been just fine. We wouldn't even have the bow at all if they stuck to staying with what worked. They developed better weapons as they learned.

The american indian developed better bows and when the whiteman came along and started shooting them with guns they soon realized that the gun was a better weapon. So, they started using guns when they had access.

I'm pretty sure theymade the highest draw weight bows they could make in order to bring the game down as quick as possible and would wounder why you would use somethinh lighter. If they had 70#+ compounds they would have been ecstatic.