I do not think that there is any other quality so essential to success of any kind as the quality of perseverance. It overcomes almost everything, even nature.
- John D. Rockefeller
Through aggressive business strategies, John D. Rockefeller’s Standard Oil achieved a virtual monopoly over the oil industry in the United States during the late 19th and early 20th centuries. It controlled nearly 90% of oil refining and distribution in the country.