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The largest and deepest dataset, absolutely, but raiders and traders blurred those boundaries even before modern transport technologies. Y-chromosomes in eastern England: at least 50% are indistinguishable from stay-at-home Germanics on the Continent. And 10% are Norse.

I also have grave suspicions about "didn't interbreed" in the context of pre-20th C British. Didn't intermarry? Perhaps. Didn't interbreed is lol, esp if they had money.

Most English settlers didn't have money, but there were so many of those its hard to believe they didn't leave a larger genetic footprint. This map has about as much English as I'd expect in Columbia, not one of Australia's siblings.

Open to what you say on intra-US migration, but I'd really like to see data.

Silberengel 1y ago

"The most commonly reported ancestries of White Americans include English (12.5%), German (7.6%), Irish (5.3%), Italian (3.2%), and Polish (1.3%)...

The study concluded that English ancestry is the most common European ancestry among white Americans, with this component ranging between 20% (Wisconsin, Minnesota, North Dakota) and 55% (Mississippi, Tennessee, Arkansas) of the total population (regardless of race) in all 50 states."

Probably has a lot to do with population-density and age. 🤔 Or the map really is just made up.

https://en.m.wikipedia.org/wiki/White_Americans

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Silberengel 1y ago

Interesting, how the genetic test identifies twice as much English ancestry, as self-reporting did. Suggests that it's historically further back.

I'm also, apparently, more Northern European than the median White American, which is funny.