StrypeyIf you're interested in the history of big demographic changes, you could learn about the period called the "Age of Exploration". A euphemism for despotic, theocratic empires - mostly but not exclusively European - sending out huge numbers of people to invade other people's countries - mostly but not exclusively brown people - and kill or enslave them.
This is the real Great Replacement, of brown people in their own countries (eg the US, OZ and NZ) by Europeans. Read a book.
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