Carnegie Steel was a major steel company founded by Andrew Carnegie in the late 19th century in the United States. It played a crucial role in the industrial revolution by producing large quantities of steel, which was essential for building infrastructure like railroads, bridges, and buildings. The company became known for its innovative production techniques and efficient management practices. In 1901, Carnegie Steel was sold to J.P. Morgan and merged with other steel companies to form U.S. Steel, the first billion-dollar corporation in the world. This merger marked a significant consolidation in the steel industry, shaping the future of American manufacturing and contributing to the nation's economic growth.