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By 1900 John D. Rockefeller, founder and largest shareholder of the Standard Oil Company, controlled more than 90 percent of U.S. oil production, dominating the world market. Rockefeller controlled pipelines and arranged for secret, discriminatory railroad rates, which allowed him to cut prices and force competitors out of business. Rockefeller’s conglomerate of companies was called a “trust” or “combination.”
Prints and Photographs Division, Library of Congress