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There's an entire book from the author on this topic [1] [1] https://www.amazon.com/American-Nations-History-Regional-Cultures/dp/0143122029 https://www.amazon

• madcaptenor 1y ago
  I've read the book and it's interesting. I don't recall him explicitly explaining the methodology and so I had the same question - from that link it sounds like the methodology was more ad hoc originally but now it's on more of a solid quantitative footing.