How did John D.Rockefeller's Standard Oil Corporation come to control 95 percent of the nation's oil refining capacity by the 1880s?

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John D. Rockefeller's Standard Oil Corporation came to control 95 percent of the nation's oil refining capacity by using predatory pricing to drive competitors out of business and then creating a trust, which allowed him to consolidate control over the remaining companies in the industry. The trust acted as a legal monopoly, giving the Standard Oil Corporation near-total control over the oil industry.

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