Why were John D Rockefeller Andrew Carnegie and JP Morgan called the Captian's of industry?

John D. Rockefeller, Andrew Carnegie, and J.P. Morgan were referred to as "Captains of Industry" because they played pivotal roles in shaping the American economy during the late 19th and early 20th centuries. They were instrumental in the growth of major industries—oil, steel, and finance, respectively—driving innovation, increasing productivity, and creating vast wealth. Their business practices, while often controversial, contributed to the expansion of the U.S. economy and established them as influential figures in American history. Their legacies include both significant economic development and the emergence of large corporate entities.