USA HISTORY

Detailed explanation-1: -By age 30, Carnegie had amassed business interests in iron works, steamers on the Great Lakes, railroads, and oil wells. He was subsequently involved in steel production, and built the Carnegie Steel Corporation into the largest steel manufacturing company in the world.

Detailed explanation-2: -In the early 1870s, Carnegie co-founded his first steel company, near Pittsburgh. Over the next few decades, he created a steel empire, maximizing profits and minimizing inefficiencies through ownership of factories, raw materials and transportation infrastructure involved in steel making.

Detailed explanation-3: -Carnegie Steel Company was a steel-producing company primarily created by Andrew Carnegie and several close associates to manage businesses at steel mills in the Pittsburgh, Pennsylvania area in the late 19th century.

Detailed explanation-4: -However, he decided to invest more time in the steel industry in 1875 and built his own steel plant in Braddock, Pennsylvania. Known as the Edgar Thomson Works, Carnegie’s steel mill adopted the Bessemer steel-making process and any other technological innovations that helped factory operations run more efficiently.