In 1900, two-thirds of the nation's... citizens still lived in rural communities... But that was changing rapidly (by 1920 more than half of all Amer… - Henry Kaufman

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In 1900, two-thirds of the nation's... citizens still lived in rural communities... But that was changing rapidly (by 1920 more than half of all Americans lived in cities), thanks in large part to the explosive growth of manufacturing. ...[T]wo-thirds of the nation's output was in manufactured goods, even though manufacturing employed less than a quarter of the work force. The average plant producing petroleum, iron and steel, and textiles (the three leading industries)... were belied by the behemoth factories... Carnegie... christened the new century by selling his sprawling steel interests to J. P. Morgan, who promptly assembled the $1.4 billion United States Steel Corporation in 1901, the nation's first billion-dollar industry.
Still, American manufacturing was then churning out a tiny fraction—roughly 1 percent...—of what today's cleaner and enormously more efficient plants produce.