Check out the invasion of the Chatham Islands by two Maori groups, Ngati Tama and Ngati Mutunga, who all but wiped out the Moriori.
In 1835 about 1,600 Moriori lived on the islands. 30 years later there were about 100 left. The last full-blooded Moriori died in 1933.
No surprise.
When I tell it to people I leave out the invaders were Maori. Few know of it, and almost always they leap to the conclusion the invaders were European. (That no one bats an eye when I speak about the cannibalism is weird.) Typical condemnations.
'What? No, 1/n