eli5 Why are there no uncontacted tribes of White European descent?

Question

eli5 Why are there no uncontacted tribes of White European descent?

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Answer 1

Because Europe is so crowded that there are no hiding places like the great forests of n-america or the jungle of s-america or the vast emptiness of australia.

apart from that, due to satellite imaging, there are barely any unknown tribes, just uncontacted ones.