USA HISTORY

Detailed explanation-1: -Carnegie worked in a Pittsburgh cotton factory as a boy before rising to the position of division superintendent of the Pennsylvania Railroad in 1859. While working for the railroad, he invested in various ventures, including iron and oil companies, and made his first fortune by the time he was in his early 30s.

Detailed explanation-2: -He later successfully built the Bessemer and Lake Erie Railroad to haul Mesabi iron ore from the Great Lakes to his Pittsburgh steel mills, and the Keystone Bridge Company built the line’s massive 3, 400 foot long bridge over the Allegheny River near Oakmont.

Detailed explanation-3: -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-4: -Carnegie started work as a telegrapher, and by the 1860s had investments in railroads, railroad sleeping cars, bridges, and oil derricks. He accumulated further wealth as a bond salesman, raising money for American enterprise in Europe.

Detailed explanation-5: -From about 1872–73, at about age 38, he began concentrating on steel, founding near Pittsburgh the J. Edgar Thomson Steel Works, which would eventually evolve into the Carnegie Steel Company.