multiculturalism is destructive in nature.  if  you believe that diversity is a good thing, and you enjoy diversity  then  you have a duty to preserve diversity for future generations  --  where  multiculturalism exists  there  will be an inexorable synthesis of cultures and racial types over time until only 1 product remains. that is just synthesis basics, and applies readily to cultural/racial types.  and  throughout said synthesis the formulae will apply:  diversity + proximity = conflict  --  thus  - multiculturalism destroys diversity  - multiculturalism generates conflict, endless blame games, malicious leaderships, unfair policies and governance, inequities, wasteful noise, and necessitative hostility toward outgroups for the benefit of the righteous and natural defense of diversity itself.  and finally  separating via culture and race is in all humanity's best interests.
United States