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How did Rockefeller monopolize the oil refining business?

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In 1863 John D. Rockefeller joined Maurice B. Clark and Samuel Andrews in a oil-refining business based in Cleveland, Ohio. read more

John D. Rockefeller was able to monopolize the oil industry in the 19th century by buying out smaller companies and working with the railroad companies to put his competitors at a disadvantage. At one point, Rockefeller controlled 90 percent of the United States oil industry. read more

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