I personally look at those as nations and/or cultures. I don't think Poles, Germans, Italians or Americans come in any particular race. I know plenty of people who are German and Italian who are not white but are also strongly culturally German or Italian. I think race and culture and nationality are being confused in this discussion - while they often go together, in terms of identity, they're separate things altogether. A person born in Germany with one parent who comes from, say, Jamaica and is of African descent and one who is from England and is considered to be white could be culturally German, with strong ethnic/cultural influences of England and Jamaica, and be of mixed race, but also be Black as well if they so choose.
Get used to me. Black, confident, cocky; my name, not yours; my religion, not yours; my goals, my own; get used to me. -Muhammad Ali