Technology change caused the growth of the industry in northern cities. Corporation (limited liability), Bessemer steel process, light bulb that was by Thomas Edison, telephone that was by Alexander Bell, Airplane that was by Wright Brothers, and Assembly Line Manufacturing that was by (Henry Ford) have changed the 19th into an industry century.
Who led the enormous expansion of the American steel industry.
The founder of Finance.
founder of the Standard Oil Company.
The first man who built Railroad.
Reasons for economic transformation.
First, increasing labor supply such as the immigrants. Second the benefits for the builders was an incentive as well. Last but not least is the natural resources and the navigable rivers.