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Yes,it is unlikely that humans finished megafauna alone.They could be last straw that break camel back/in America,literally/ But - i have good explanation for Democrats - megafauna in Americas died,becouse indians stopped voting for democrats and choosed Trump!

Your ancestors also faced giant birds.Some claim,that they hunt children to our times! Back to topic - what do you think about early humans making iron from bog-iron? P.S still,they need to work less then settled people.And,were more healthy.

Well,that explain everything. P.S i remember some short sci-fi novel/forget author and name,as usual/ Where aliens come to Earth with goal of uplifting us.Problem is - humans want to remain hunter-gatherers. So,when visitation come,local alien builded city,bribed locals with pretending to be...

You need mines for that.One for copper,other for zinc.Which mean at least city-states. In age of hunter-gatheres,not possible. To be honest,better chances would be with iron made from bog-iron.