> What were we up to during those times? You don't have to go that far in human history to ask such question. E.g. we don't know much about Mississippian cultu

> What were we up to during those times? You don't have to go that far in human history to ask such question. E.g. we don't know much about Mississippian culture (https://en.wikipedia.org/wiki/Mississippian_culture https://en.wikipedia.org/wiki/Mississippian_culture).