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I doubt Brazilians were ever majoritarily 90%+ European. I think we shouldn't underestimate the impact class stratification had in Brazilian genetic substructure. People who DNA test are generally at the top of the social pyramid and that is why Brazil comes out as much European or even more than Argentina in collections of GEDmatch kits.
This is probably one of the biggest studies ever done in Brazil (+15000 samples). In São Paulo and Rio de Janeiro(the most sampled regions), whites are firmly around 80% European. For some reason, whites from most other regions here are more European, including white northeasterners, averaging 85% European. Only pardos from Vitória and São Paulo are over 60% European on average. Very few people among the whites are over 90% European. Most people sampled had high educational levels.
https://www.theapricity.com/forum/sh...-15-105-Sample
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