Franklin’s theory of breeding would remain a staple of American exceptionalism for centuries to come. He provided three irresistible arguments. First, he promised that class stability accompanied western migration. Second, he reasoned that the dispersal of people would reduce class conflict and encourage a wider distribution of wealth among the population. Third, what he called a “mediocrity of fortunes” was his belief in the growth of a middle-range class condition. His farming families were not poor or self-sufficient, but engaged in some form of commercial farming, producing enough to
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