![]() Steel in 1902, the company became the dominant steel supplier in the U.S. through a vertically-integrated manufacturing process that consistently incorporated the latest technological innovation. ![]() Railroads expanded westward, urban populations grew–necessitating the introduction of skyscrapers and thus more structurally resilient materials–and legacy infrastructure needed replacement.įrom Andrew Carnegie’s founding of Carnegie Steel in 1875 until its sale to U.S. entered a period of economic expansion following the Civil War, mass-produced steel became increasingly in demand.
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