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: -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-3: -Andrew Carnegie, (born November 25, 1835, Dunfermline, Fife, Scotland-died August 11, 1919, Lenox, Massachusetts, U.S.), Scottish-born American industrialist who led the enormous expansion of the American steel industry in the late 19th century. He was also one of the most important philanthropists of his era.

Detailed explanation-4: -Andrew Carnegie became the undisputed king of steel in the 1800s. He crushed competitors backed by J.P. Morgan, Andrew Mellon and other captains of finance. Carnegie also reaped profits by investing in railroad-related firms, bridges and oil operations.