It is worse than that; look at the preferential treatment accorded certain groups, and the economic fallout from that, and it is “balkanization” in the truest sense: It leads to the same outcome. To rob white & Asian men of economic opportunity is criminal; there is no legal justification for preferential treatment of black, Hispanic, and female students for college access, government jobs, small business loans, etc., yet it is openly practiced. It has reduced the American birthrate significantly, with devastating effect; the country is unrecognizable and dysfunctional.
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Unfortunately, parasites always follow their hosts. They will storm the borders of the productive areas.