Over the course of his career on Wall Street, J.P. Morgan spearheaded the formation of several prominent multinational corporations including U.S. Steel, International Harvester and General Electric which subsequently fell under his supervision. He and his partners also held controlling interests in numerous other American businesses including Aetna, Western Union, Pullman Car Company and 21 railroads. Due to the extent of his dominance over U.S. finance, Morgan exercised enormous influence over the nation's policies and the market forces underlying its economy. During the Panic of 1907, he organized a coalition of financiers that saved the American monetary system from collapse.