That is not to say there were not also admirable societies, or others that had admirable qualities among their less-so. Humanity is messy everywhere. And, it is tragic that present and future generations will need to re-learn what many of them discovered long ago, what of it is ever rediscovered.
The inhabitants of the Amazon region perfected mixed tropical tree agriculture compatible with annual flooding, starting more than 10,000 years ago. Their society may have taken a huge hit from diseases brought by Africans early in the 14th century; archaeology reports a major bump of re-forestation about then. But it must have been diseases the Spaniards brought that permanently wiped out the whole Amazon civilization.
The entheogenic drug protocols invented there, plus chocolate, manioc, and sweet potato are about all we have left of that civilization.