You seem to have a better perspective on this than me, but isn't it also a question of how much people talk about race issues in the US vs. Europe? To me it seems like a bit of a mixed bag:

* US Americans are generally very sensitive to the issue and try to be PC as much as possible.

* Europeans are rather insensitive to it, which shows in two ways: A lot of people seem to be more color-blind, which IMO is the upside, and a smaller but very visible bunch of people are more openly racist.

* This also applies to public discussions - the skin color of immigrants or inhabitants is rarely mentioned, people and the media rather just differentiate between natives, people with immigration background and immigrants - here in Switzerland maybe with special mentioning of Germans, French and Italians, as those three originating countries tend to be the most prevalent. Thus, it seems much less a race-, than a nationality issue.

* On the topic of numbers, I gotta say I think it depends. Here in Switzerland roughtly 30% of inhabitants don't hold Swiss nationality, tendency rising rather quickly. Of those, roughly half come from neighboring countries (i.e. culturally close), the other half is mostly from Ex-Yugoslavia, Middle East and Northern/Central Africa. Switzerland today seems much more like a melting pot than it was a decade ago, which is something I actually appreciate (I married an Asian immigrant myself and my son has two nationalities, which is actually a majority phenomenon in the whole greater Zurich area now).