I dont even understand this sentence.
Yes, you truly do not understand. Nationalism is widespread across the world. And where it is weaker it is often replaced by other forms of identity that can become even more dangerous - can I mention what's happening in Kenya now?
The short-term danger I see in multiculturalism is of it providing a good breeding ground for violence, exploited by unscrupulous leaders. A sufficiently "institutionalized" society will manage to prevent that kind of thing getting out of hand, but still risks some violence. On the whole the risk in Europe is low, and in fact there have been no racial or religions riots here in recent history. Even the famous Paris riots (which only damaged property) were not motivated by
race, but by economic and social class differences. Some sporadic gang violence may be organizing along vaguely "ethnic" lines (or what people the people involved
believe are ethnic lines) but tis is also not really relevant.
The real danged would be falling into a vicious cycle where some people got discriminated for being "different", leading to resentment, leading to more people who shared identity traits withe the discriminated to affirm an identity different from, or even opposed to, the mainstream one, leading to more discrimination... What starts with individual problems over social identity then becomes a large-scale social problem involved opposing communities. The fear of multiculturalism causing social unrest thus becomes a serf-fulfilling prophecy, trough the reaction against it .
Veils are rather common. Head scarfs are very common. As for prayer rooms you won't find many. If a muslim needs to pray he can do it in the break room. At my highschool they used the teachers lounge. You won't find many religious 'extras' at the typical American work place.
I never got why a big deal was made over the wearing of veils in some european countries. It probably wouldn't have become an "issue" if it hadn't received attention, and new generations might slowly even abandon it. Now they instead cling to it. If americans dealt with the "problem" of religion in the workplace by ignoring it, they probably did the right thing: that way it never became a problem!
Some europeans, however, would also claim the same: we don't see the any problem, provided muslims don't expect different treatment; they do, therefore they are the ones causing the problem. I really don't know about this, I've never had a chance to watch this kind of issue happening.