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In order to be part of an ethnic group/nation you have to fit in with your phenotype. This is the cold truth for some that lead people to have identity crisis. For example, a person who is half black/half Russian trying to fit in as a Russian. Even if he grew up and thinks like Russian wholly, he will still have a hard time being accepted. While, a Russian/French mix will have much easier. So generally this happens when the mix is between far apart races e.g. negroid/caucasoid