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In one of the most famous paragraphs of our most famous autobiography, Henry Adams located the precise moment when “eighteenth century troglodytic Boston” joined industrial America: “the opening of the Boston and Albany Railroad; the appearance of the first Cunard Steamers in the bay; and the telegraphic messages which carried from Baltimore to Washington the news that Henry Clay and James K. Polk were nominated for the presidency. This was May, 1844.”
James W. Carey (1983) studied this question.