Both right and left populists share at least 1 idea in common; a legend of a Golden Age that we can and should "go back" to. For the right, it's a mostly mythical version of the 1940s/50s, where different races keep to themselves, mostly within ethnically homogeneous nation-states. For the left, it's the heydey of the Keynesian welfare state, between the mid-1930s and mid-1970s.
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