There's nothing wrong with multiculturalism. Don't you enjoy sampling the cultures of others? You don't enjoy food, art, fashion, literature, film, etc. from outside your ethnicity? Multiculturalism produces powerful nations. Most of the strongest countries and empires in history were a cosmopolitan mix of peoples. America is the most powerful nation in the world partially due to its diversity. The problem is people disrespecting their host countries and leeching off of them, behaving as a rude parasite and not as a citizen, as we see with the radical Muslims who move to the West to enjoy our material success yet hate the West.
I really respect America's diversity which is its strength...but I expect cultural oneness in my country.