“Human happiness,” the Greek historian Herodotus once observed, “does not abide long in one place.” In its 240 years or so of existence, the United States has experienced similar ebbs and flows, with Boston replaced as the nation’s commercial capital first by Philadelphia and then by New York. The 19th century saw the rise of frontier settlements—Cincinnati, Pittsburgh, Cleveland, and finally Chicago—that also sought out the post position. In the mid 20th century, formerly obscure Los Angeles emerged as New York’s most potent rival.
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