In the United States, martial law has been used in a limited number of circumstances, such as directly after a foreign attack, such as Hawaii after the Japanese attack on Pearl Harbor or New Orleans during the Battle of New Orleans, after major disasters, such as the Great Chicago Fire of 1871 or the San Francisco earthquake of 1906, by renegade local leaders seeking to avoid arrest, such as Nauvoo, Illinois during the Illinois Mormon War, or Utah during the Utah War, or in response to chaos associated with protests and mob action, such as the 1934 West Coast waterfront strike, or mob actions against the Freedom Riders.
The martial law concept in the United States is closely tied with the right of habeas corpus, which is in essence the right to a hearing on lawful imprisonment, or more broadly, the supervision of law enforcement by the judiciary. The ability to suspend habeas corpus is related to the imposition of martial law.[33] Article 1, Section 9 of the US Constitution states, "The Privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it." There have been many instances of the use of the military within the borders of the United States, such as during the Whiskey Rebellion and in the South during the Civil Rights Movement, but these acts are not tantamount to a declaration of martial law. The distinction must be made as clear as that between martial law and military justice: deployment of troops does not necessarily mean that the civil courts cannot function, and that is one of the keys, as the Supreme Court noted, to martial law.
In United States law, martial law is limited by several court decisions that were handed down between the American Civil War and World War II. In 1878, Congress passed the Posse Comitatus Act, which forbids military involvement in domestic law enforcement without congressional approval.
