This video, the second episode of "The Men Who Built America," focuses on the industrial expansion of the United States following the Civil War, primarily highlighting the rise of Cornelius Vanderbilt in railroads and the emergence of John D. Rockefeller in the oil industry. It details the fierce competition and strategic battles between these titans, including Andrew Carnegie's early career under Tom Scott and his ambitious project to build the first bridge across the Mississippi River using steel. The episode also touches upon the economic challenges, the development of the steel industry, the Johnstown Flood, and the growing rivalry between Carnegie and Rockefeller, setting the stage for future conflicts.