Ethnostates as the default social force in world history

In his excellent journal "Chronicles" (Feb 2019) Chilton Williamson suggests that populism is more or less the default social force in world history, from the right or the left, which rises against dominant classes that have taken over and who disfavor the normal natural behavior of the classes below them. I think of the default social force as the return of real human nature rising again and projecting its traits on our social behavior and cultures.

What are the traits of human nature which always rise and influence the shape of our cultures? You hear it here often, human nature is basically kin-centered, gender defined, age-graded, heterosexual, marriage-making, hierarchical, ethnocentric, territorial, and even xenophobic, and religious-making, among other things, with group-selection as the primary unit of successful selection, followed by individual selection. Cultures can operate for a time with behavior that goes against this human nature, with such experiments as Marxism, but cultures are eventually pulled back by the biological and genetic leash of real human nature to cultures that better reflect real human nature, and humans then work within and adapt to the environments they find themselves living in.

We could think of human nature as the structure upon which cultures, governments, etc. rise as a superstructure. The superstructure then becomes so gross and oversized (think empires) that it falls apart. But the foundation structure grounded in real human nature remains intact because even the smallest change in human nature and our DNA structure, for example, in our immune system, takes hundreds of thousands of years to change (although now we have genetic engineering which may be more rapid),

I think a clear-eyed and courageous view of human nature and the biological origin of our social behavior suggests that the default social force, driven by real human nature, is a return to ethnostates and an ethnopluralism of ethnostates. In the U. S. that could work in sync with federalism and the Constitutional separation of powers and states. This return to ethnostates would best be done legally, constitutional, and not by radical or revolutionary means which almost never work and cause great biological and cultural disruptions and convulsions.