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Cultural Regions of the United States
(lemmy.autism.place)
For the map enthused!
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post relevant content: interesting, informative, and/or pretty maps
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It's a mathematical property of regions of a 2D space that 3 will naturally meet at a point, but 4 or higher have to be contrived to meet at a point. In the US we do have the 4 corners, which is where Arizona, New Mexico, Colorado, and Utah, so there is precedent.