Continuing to look back at what once was. Following Part 1's emergence from the civil war and the age of enlightenment, In Part 2 of the 4 part History Channel series, America continues to recover from the Civil War, undertaking the largest building phase of the country s history. While much of the growth is driven by railroads and oil, it's built using steel. 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.