It is more misleading to count somebody as different who is second or third generation American and who has fully adapted American culture values and norms but count that person as more different to the host country due to different skin color or remote country of origin than a Spanish person whom just settled in Switzerland.

The slightly racist assumption in America is that if I as a white Norwegian settle in America I contribute less to diversity than a black American who has lived his whole life in America.

In America diversity is all about what you see on the outside.

To be fair, this kind of diversity is important because in the US it still matters (very much!) what you look like on the outside, regardless of how long your ancestors have lived here. It'd be great to be in a post-racial society but we're very far from that.

It is not misleading at all, you have to learn a new language, learn to deal with a different government and laws, we are talking several years of effort until you get accustomed.

The differences between accepted social behaviour in Britain, Spain and Poland are significant too.

Sure, if you came from Saudi, you'll feel more out of place. But it's not trivial.

I think only Americans can really swallow the canard that “Western European culture” is some uniform thing. If you’ve spent any time around people from the various parts of Europe, you’ll know that they have all kinds of opinion about their neighboring countries, some gentle, some cruel. But all see themselves as quite distinct. Certainly the Swiss do!