is there some sort of cutoff point where scientists decided “everyone in Ireland 100,000 years ago will be considered 100% Irish”?
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It has with how the genetic testing companies decide what genetic sequences are “assigned” to a particular country or region.
Basically they take samples from a bunch of people in a given geographical area and note the common sequences in that area. When you get your DNA analyzed the compare your sequences to those of the people known to live in that region. if they see your gene sequences are most similar to the ones they collected from Germany, they’ll say you are likely German with a percentage similar to how much of your sequences resemble those of people from Germany.
There are/were some issues with France. France makes it illegal to test DNA for ancestry. Even though it is illegal some still get it done (or do it in another country). So while many companies can pinpoint locations in a country from which your ancestors hail, the location of your ancestors in France is harder to determine.
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