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The racial ideas of /pol/ users are typically composed of literal Jim Crow era beliefs. Which probably came about by many of the republican users on here being raised by their fathers in that environment.
The Jim Crow beliefs were not independently created in America, instead it was a legacy the Europeans who colonised America brought over.
Of course Europeans today accept that these ideas are not only unscientific, but that they border on religious beliefs in their nature.
But many Americans in the south (especially Trump voters) are still living til this day with 17th century racial theories in their mind.