The Gilded Age was marked by the rise of powerful industrialists - but four men in particular are known for the power they wielded and the complex legacies they left behind. John D. Rockefeller transformed oil. Andrew Carnegie's steel empire was built on efficiency and reinvestment. Cornelius Vanderbilt revolutionized transportation and railroads in American and J.P. Morgan's financial prowess consolidated entire industries. Together, these men permanently reshaped the American economy for ge...