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David Stebenne’s “Promised Land: How the Rise of the Middle Class Transformed America, 1929-1968” invites us to remember those decades in which both the middle class and the Democratic Party were ascendant. Mr. Stebenne, a professor of history at the Ohio State University, offers more warning than nostalgia, for his lesson is that “the rise of the middle class, and the growth of the mechanisms that powered it, eventually undermined the stability of that achievement.” Nemesis stalked the suburban tract homes of 1958.