probably very few, if the old testament or the huge proportion of ancient skeletons that died violent deaths serve as any guide. which is why I think this story by Reich is very tone deaf. It's hard to see how a 90% population replacement promotes feelings of unity and hand-holding.

One imagines a superposition of a video feed of the invasion of the steppe-people on horseback, stampeding the native defenses, cutting the male children's throats and raping the women, with a video a David Reich being like "we're all a little mixed".

Tone deaf indeed. It seems common for people not to ascribe a full measure of humanity to humans from the (distant enough) past. Thought exercise: are there any large-scale population replacements happening today, and how do people feel about that? Surely not a kumbaya feeling I'd bet.

In the recent past: the Americas, Australia, New Zealand, Fiji?, etc.

Current: Tibet, West Papua, Rwanda?, Northern Europe perhaps?

Add Xinjiang to the list of current ones - from https://www.nytimes.com/2019/03/02/world/asia/china-muslim-d..., flagged off the HN front page: "Decades of migration by Han, China’s dominant ethnic group, have transformed Xinjiang, fueling Uighur anxieties. Uighurs, once the majority, are 46 percent of the region’s 22 people million people, Han are 40 percent and Kazakhs 7 percent, according to government estimates."

It's easy to find these in the relatively recent past. See: North America.