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the Progressive movement had been swelled before the turn of the century by the enrollment of America’s urban middle class, its conscience awakened by Lincoln Steffens, Jacob Riis and other muckrakers who dramatized the poverty of the slums, and by the testimony of its own eyes, which could see all too well—in the horrors of child labor and the sweatshop—the problems that flowed from the new industrial order.
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Robert A. Caro (The Power Broker: Robert Moses and the Fall of New York)