The company Rockefeller started at age 23, Standard Oil, came to hold a virtual monopoly on the American oil industry. He maintained control of Standard Oil until its eventual break-up by the U.S.

Rockefeller Sr. with family. Rockefeller Archives. The so-called Cleveland Massacre was the beginning of John D. Rockefeller's drive toward an oil monopoly, and it is considered one of his ...

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When Ida Tarbell traveled to Cleveland to observe John D. Rockefeller, Sr., the man she had been writing about for two years, she chose not to confront him face to face. For two hours, she sat ...