My sense from the review is that this book might miss another dimension of class in America having to do with the different settler populations. He's written another book review on Albion's Seed, which illuminates this aspect: https://slatestarcodex.com/2016/04/27/book-review-albions-se...
In short, class means something different in parts of the country. With inevitable mixing as people move to different states and especially cities, I've witnessed quite complex dynamics.
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