I don't even know where to start with this. Every single thing you've said or implied is so wrong it's also based on something wrong.

If I had to guess I'd say your view of ancient and even slightly pre-modern societies is entirely extrapolated backwards from eurocentric capitalist just-so stories and takes no account of anything else–not to mention that my mention of global imperialism just meant a relatively wealthy north American culture 2000 years ago wasn't necessarily exploiting a devastatingly poor European one, because that would have been impractical, so only regarding cultures within practical reach of one another is more sensible than a global comparison is a more sensible measure of this for most of human history.

Except the Antarctica thing. Maybe.