Five hundred years after the main phases were finished, the people who raised it had vanished. No clear genetic trace left behind. A thin residue of similar ancestry turns up later, maybe a few per cent, up to about 8%, but it could just as easily have arrived already mixed from the continent.
This was a population wipeout more complete than any colonial catastrophe we can document from history. We don’t know what caused it: disease, violence, or being outbred. No historical parallel or evidence yet explains it. The only close match is the unexplained and complete disappearance of the Dorset people of the Arctic.
The stones stood. The bloodline did not.
More detail and the data:

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