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Her study of Rockefeller's practices as he built Standard Oil into one of the world's largest business monopolies took many years to complete. ... The Court found that Standard was an illegal monopoly and ordered it broken into 34 separate companies.Journalist Ida M. Tarbell witnessed John D. Rockefeller's tactics in the 1870s, when the Standard Oil Company forced her father and other… The History of the Standard Oil Company, by Ida M
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