Yes there are many examples of genocide when one people overwhelms another:
The ancient Beringians (native Americans) were wiped out by the mongoloid Amerindians. https://beringia.club/m/the-beringian-story
Mongols erased entire races and civilizations or severely genocided them as in Russia.
The list is endless and is simply history. Land belongs to those who are strong enough to take it and determined enough to hold onto it.
