Sorry your west med is higher than average I'd like to push Romanian to more Baltic, you just don't cut it.
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My father can look like a Czech with a Syrian migrant grandparent on some. He’s real future European :)
Primary Population (source) Secondary Population (source) Distance
1 82.1% Czech (derived) + 17.9% Druze (derived) @ 1.68
2 81.5% Czech (derived) + 18.5% Lebanese (derived) @ 1.78
3 82.7% Czech (derived) + 17.3% Jew_Georgia (derived) @ 1.86
4 81.8% Czech (derived) + 18.2% Syrian (derived) @ 1.9
Why? Most ethnic groups used to be a lot smaller than today because until recently the birth rates were generally high, so if there were 1 million people in 1800, in 1950 there would have been 3 million or more. Africa had like 200 million in 1950 and 1.1 billion in 2020 simply because of the growth rate. Small countries tend to have a limited gene pool, many Muslim countries are very inbred for example.
Believe it or not our population didn't grow much in last century :(
My perception is based on idea we were in Austro-Hungarian Empire and mixing mostly with other Central Europeans, while in Yugoslavia we mixed with other Balkan people including BiH Croats, who are now very present in Croatia itself and 100 years ago it was not the case. I doubt we changed much, but I believe it's logical to expect we became bit more Balkan shifted.
Same applies to Slovenians.
While reverse happened in Serbia, they became bit more central European shifted since large influx of Serbs from Croatia and Bosnia. Now we are closer than we were, I'd say.