Imagine a world where the Chinese found Europe and declared it all to be a single country, and like the British tried in India, attempted to impose the Chinese language and culture on the whole continent.
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In such a world, there would only be Han Chinese, all the other races having been slaughtered to a man, woman, and child.
And in this reality, that is still their intent - with the manufacture of genetic DNA-based racial bio-weapons.
Ultimately, yes.
As immune to a novel disease as a mono-culture of Gros Michel bananas.
And then there were none...