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…showed last 75 words of 265 total…bridges. He later founded a steel mill and was one of the earliest users of the Bessemer process of making steel in the U.S. Carnegie was extremely successful, acquiring a controlling interest in other large steel plants. By 1899, when he consolidated his interests in the Carnegie Steel Company, he controlled about 25 percent of the American iron and steel production. In 1901 he sold his company to the United States Steel Corp. for $250 million and retired.