Oh. I've never thought of Anglo-Saxon as being an ethnicity before.
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When I think of ethnicity, I think of a community of people with their own culture and customs and special foods different than the standard of a particular country's norm.
So like in the US, it wouldn't be ethnic to be a person that eats hamburgers and hotdogs and watches baseball, because that is the stereotypical American culture. Being in an Italian community within America would be an ethnic community. However, if a person lives in Italy, it wouldn't be ethnic for them to eat pasta and speak Italian. That would be them being Italian. If I went to Italy to live on a USAF base, hung out with a group of Americans, we all spoke English, watched American shows, played American football, ate a thanksgiving meal, that would be ethnic in Italy. It would simply be American in America.