Following Part 1's emergence from the civil war and the age of enlightenment; and Part 2's undertaking of the largest building phase in the country's history. Part 3 of the 4-part History Channel series takes us from the beginning of steel and oil having forever changed the face of America, to JP Morgan arriving on the scene and expedites growth through a magical thing called finance. From the Civil War to the Great Depression and World War I, for better or worse; for richer or poorer, in ethical and societal sickness or health; these five men - John D. Rockefeller, Cornelius Vanderbilt, Andrew Carnegie, Henry Ford and J.P. Morgan - led the way.