Is it almost over, this unique experiment of retaining a multicultural and multiracial American nation?

As we now wait for our cities to explode with protesters and rioters following any verdict in the alleged white policemen killing of black man George Floyd, I ask: Is this unique experiment of retaining a multicultural and multiracial American nation with all groups living together in harmony over? I don't think the Founders ever thought America would have a large number of non-European, yet alone non-Northern-European inhabitants. Was it a noble experiment? Not really, although it fit in with idealistic religious and Rousseauian idealistic values.

The problem stemmed from a tragic misreading of real human nature, which has been and remains genetically ethnocentric, even xenophobic, as well as being kin-centered, gender defined, age-graded, heterosexual marriage-making, hierarchical, with group-selection as the primary unit of selection, followed by individual-selection. You can't build a lasting multicultural and multiracial nation with real human nature. 

I will say it again and again, the real challenge of ethnocentric and xenophobic human nature is to move beyond the supremacism that has plagued it. This suggest that if the noble statesman of the future see guardianship of the state as trying to avoid sedition, discord, and civil war, they will honor the biological origin of social behavior by taking on the damaging racial competitions disguised as calls for equality etc., and advocate the creation of an ethnopluralism of ethnostates for all groups, black, white, brown, yellow, or red, in harmony with real human nature. Then they will protect each ethnostate from marauding imperialists, global businesses, supremacists, chosenists, Marxists, etc. An ethnopluralism of ethnostates could be established, legally, in the United States with our constitutional separation of powers and states.