[sridca]

Yup, there are 4 combinations in total. For example, a white American will see:

1. Someone of different nationality (eg: a white Australian)

2. Someone of different ethnicity (eg: a Black American)

3. Someone of both different nationality and ethnicity (eg: a fresh off the boat immigrant from India)

4. Someone of same nationality and ethnicity (i.e., fellow white Americans).

Now one may, in principle at least, accept that all these categories of people should be treated with impartiality and respect in every sphere of life ... however can they also sincerely report not feeling these identities as separate? I think this is what anthuman is getting at.