Does multiculturalism in a nation cause more harm than good?

I think multiculturalism is a recipe for a waiting disaster. Once you start mixing a society with various different religions, languages, cultures, different social mannerism, ethnicities and political beliefs is bound to cause lots of problems within that nation. Thoughts?
Does multiculturalism in a nation cause more harm than good?
Does multiculturalism in a nation cause more harm than good?
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