I would quibble on the details of the map, as the borders are not hard but soft overlaps. For example, New York City does not reall fit the foundry concept, unless you consider the stock market a foundry, and all of Texas is one big overlap of 1, 2, 4, and 7....
And it doesn't cover the urban/rural dichomy. Los Angeles and New York City and Boston have more in common, than Dallas and San Angelo, 400 KMs away. Look at the 2004 county by county map of the presidential campaign to see what I mean....
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