How can we best live in the world if one ethnic group's gain is equal to the another ethnic group's losses?

Modern liberals who are usually lost in political fantasy-land do not want to see that ethnic or racial interactions are mostly a zero sum game, one player's gain is equal to the another player's losses. We can see this in the rise and fall of different ethnic groups in America in politics, business and sports. For example, as liberals gleefully tell us, whites will soon be a minority in the country they founded, and as the people change the culture changes. Will Europe become increasingly Islamic?

The science of sociobiology has also empirically shown us that group-selection ranks higher than individual selection in survival and reproductive success, which is why human nature is kin-centered and ethnocentric. Even the totalitarian forces of fascism on the far left (Marxism) or the far right (Nazism) can't make distinctly different people and cultures harmoniously the same. So how can we best live in the world if one ethnic group's gain is equal to the another ethnic group's losses?

We don't want fascism on the right or the left because totalitarian force doesn't work any better than the politically correct cultural Marxism we now suffer under. We need to see, as one writer put it, that the differences that are tearing us apart can put us back together again if we can learn to affirm an ethnopluralism of ethnostates, which can be federally protected, at least in America, by the constitutional separation of powers and states. That is the sane and rational way to go, given real human nature.

Can modern liberals and even some conservatives give up their egalitarian and universal fantasies and avoid, or at least greatly limit our inevitable social and ethnic disruptions, by forming an ethnopluralism of ethnostates? First we have to establish that it is not politically incorrect to even suggest an ethnopluralism of ethnostates.