The Black Gold

Oil and Rockefeller is just like fish and water, where there is an oil, Rockefeller will always there. John D Rockefeller started his oil business in 1800 in Cleveland, Ohio, USA. He began to build his Oil Kingdom by renting his transportation fleet 'The Union Tanker Car' to ship crude oil from oil wells which just discovered in Ohio to the refinery factory in New York.
During 1900 - 1910, The Standard Oil controlled almost all oil fields in California. In the beginning of the twentieth century, his company was the only oil company which controlled oil supply in the world.
In 1911, his giant company was splitted into 35 smaller companies, because the US Government declared The Anti Trust Act. To protect his wealth, he invested his money in banking, he also established 12 banks which finally all of them sold to  the US Government, and then became The Federal Reserve (The Feds).
Although he did not take control fully in oil companies anywhere, he still strong enough to control the American politics during the twentieth centuries.
According to Marshall Douglass Smith in 'Black Gold, Hot Gold' (2001), both the WW1 and WW2 were actually happened because of the conspiracy of The Standard Oil, Shell, and British Petroleum, to share the world oil wells in their control. Who knows? Even the Iraqi war recently was just the result of a conspiracy upon the need of oil.
Think about it !