Race is a biological fact. It is the most prominent and intractable fault line in any society. The idea that racial diversity can work in America even though it has never worked anywhere ever is to assume that the United States has abolished the laws of human nature. To the extent that multi-racialism has worked here at all, it is due to the willingness of whites to sacrifice their own interests in order to build a country in which race is supposed to dwindle into insignificance.
Non-whites don’t even pretend they want to build such a society. They quite naturally want America to reflect their cultures, celebrate their heroes and holidays, and not those of whites. As whites begin to understand the dangers of the forces they have set in motion, more and more will brave the insults and begin to work for their entirely legitimate interests as a race.