The nine nations of North America

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…. The article mentions some cities that are key to their regions. The book breaks up North America into nine regions with economic and cultural connections, and names a "capital" city for each of them. For example, Miami as the "capital" of a region including the Carribean. I think the article mentions some of these same cities as being important centers for their regions. EDIT: wiki page might be better for facilitating discussion: http://en.wikipedia.org/wiki/Nine_Nations_of_North_America

"The Nine Nations of North America" and "Albion's Seed" have detailed data on the distinct cultural regions of the US, but no genetic information.