How did John Davidson Rockefeller get rich?

in the oil industry
by selling supplies to the army
by mining diamonds and gold
by building railroads
John Davison Rockefeller was the founder of the Standard Oil Company, which dominated the oil industry in the U.S. As kerosene and gasoline grew in importance, Rockefeller's wealth soared, and he became the world's richest man and first American worth more than a billion dollars.
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in the oil industry
by selling supplies to the army
by mining diamonds and gold
by building railroads
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flagthe Netherlands
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flagthe United States
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flagPoland
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flagAustria
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