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I never thought of it this way before but red/blue America being approximately an urban+coastal vs suburban+interior spatial thing is a continent scale Schelling sort. The classic version is hyperlocal scale.
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The classic is race as the sorting variable, which is very visible, but red/blue requires cultural symbols to work. Leave the pickups-and-flags areas for the volvos-and-sushi areas. And you have to move much farther not just next neighborhood over.
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