In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up.

Standard Oil Co. of New Jersey v. United States, 221 U.S. 1 (1911), was a landmark U.S. Supreme Court decision that ruled that John D. Rockefeller's petroleum conglomerate Standard Oil had illegally monopolized the American petroleum industry and ordered the company to break itself up. The decision also held, however, that U.S. antitrust law bans only "unreasonable" restraints on trade, an interpretation that came to be known as the "rule of reason".

The Supreme Court of the United States (SCOTUS) is the highest court in the federal judiciary of the United States. It has ultimate appellate jurisdiction over all U.S. federal court cases, and over state court cases that turn on questions of U.S. constitutional or federal law. It also has original jurisdiction over a narrow range of cases, specifically "all Cases affecting Ambassadors, other public Ministers and Consuls, and those in which a State shall be Party." In 1803, the court asserted itself the power of judicial review, the ability to invalidate a statute for violating a provision of the Constitution via the landmark case Marbury v. Madison. It is also able to strike down presidential directives for violating either the Constitution or statutory law.

Standard Oil Company was a corporate trust in the petroleum industry that existed from 1882 to 1911. The origins of the trust lay in the operations of the Standard Oil Company (Ohio), which had been founded in 1870 by John D. Rockefeller. The trust was born on January 2, 1882, when a group of 41 investors signed the Standard Oil Trust Agreement, which pooled their securities of 40 companies into a single holding agency managed by nine trustees. The original trust was valued at $70 million. On March 21, 1892, the Standard Oil Trust was dissolved and its holdings were reorganized into 20 independent companies that formed an unofficial union referred to as "Standard Oil Interests." In 1899, the Standard Oil Company acquired the shares of the other 19 companies and became the holding company for the trust.