Did you know that during the Gilded Age, one company controlled over 90% of the nation's oil? That company was Standard Oil, founded by John D. Rockefeller in 1870. This sharp businessman saw a golden opportunity in oil, and boy, did he take it! At that time, America was buzzing with new ideas and inventions, and oil was becoming super important for things like lighting and … [Read more...] about which company was a monopoly during the gilded age