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Carnegie began to see that steel was eventually going to replace iron for the manufacture of rails, structural shapes, pipe, and wire. In 1873 he organized a steel rail company. The first steel furnace at Braddock, Pennsylvania, began to roll rails in 1874.
Philanthropy. In 1901, Carnegie made a dramatic change in his life. He sold his business to the United States Steel Corporation, started by legendary financier J.P. Morgan. The sale earned him more than $200 million. At the age of 65, Carnegie decided to spend the rest of his days helping others.