Over the course of the 1870s, the
Standard Oil Company of Ohio acquired a monopoly on
oil refining in the United States. The
Cleveland-based company was already among the largest refiners in the United States at the start of the decade, but it controlled only about four percent of the market. Under the leadership of founder John D. Rockefeller, Standard Oil began
acquiring other refineries in Cleveland, which was a center of the U.S. refining industry. By early 1872, it owned nearly every refinery in the city and controlled roughly 25 percent of the American oil refining market. Under Rockefeller's direction, Standard Oil then began acquiring refining companies in other cities, and by 1879 it controlled more than 90 percent of the market. By the 1880s, Standard Oil was using its large market share of refining capacity to begin integrating backward into oil exploration and crude oil distribution and forward into retail distribution of its refined products to stores and, eventually, service stations throughout the United States. Standard Oil allegedly used its size and clout to undercut competitors in a number of ways that were considered "anti-competitive," including underpricing and threats to suppliers and distributors who did business with Standard's competitors. In November 1906, the Justice Department sued Standard Oil of New Jersey for violating the Sherman Act. The action was brought under the
Expediting Act in the
United States circuit court for the Eastern District of Missouri. After a 15-month-long trial, the court issued its decree of dissolution in November 1909 and its opinion in December 1909. The main issue before the Supreme Court was whether it was within the power of Congress to prevent one company from acquiring numerous others through means that might have been considered legal in common law, but still posed a significant constraint on competition by mere virtue of their size and market power, as implied by the Antitrust Act. ==Judgment==