
The question of whether the president can institute martial law is a complex one, with no clear answer. While the US Constitution does not explicitly grant the president the power to declare martial law, there have been several instances in history where presidents have done so. Martial law refers to when a nation's armed forces assume the governance of an area, typically as a last resort in times of extreme emergencies, war, natural disaster, or civic dispute. While the president has the authority to deploy troops to assist civilian law enforcement, the power to declare martial law may lie with Congress, or with state officials, within specific constraints.
| Characteristics | Values |
|---|---|
| Can the president institute martial law? | It is unclear whether the president can institute martial law. The U.S. Constitution does not define or specify who can declare it, and neither does it explicitly authorise the president to do so. |
| Instances of martial law in U.S. history | Martial law has been declared in the U.S. at least 60 times, including in New Orleans during the War of 1812, in Hawaii after the attack on Pearl Harbor, and in Kentucky, Maryland, and Missouri during the Civil War. |
| Who can declare martial law? | The president, Congress, state officials, and state governors can declare degrees of martial law in specific circumstances. Generals may also declare martial law during wartime. |
| Requirements for declaring martial law | Civil rule must fail, and military authority must temporarily replace it in a time of crisis. This could include instances of war, natural disaster, civic dispute, or civil unrest. |
| The Insurrection Act | The Insurrection Act is a federal law that allows the president to deploy military forces domestically to suppress insurrections, rebellions, or domestic violence and enforce federal laws and maintain public order. |
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What You'll Learn

The US President's authority to declare martial law
The US Constitution does not define martial law, nor does it specify who can declare it. The Supreme Court has also never explicitly stated whether the president can unilaterally declare martial law. However, it has held that states can declare martial law.
Despite this, several presidents throughout history have declared martial law. For example, President Franklin D. Roosevelt declared martial law in Hawaii after the attack on Pearl Harbor in 1941. President Abraham Lincoln also invoked martial law during the Civil War, although this was Congressionally-imposed.
According to national security law scholar Joseph Nunn, martial law is a "dramatic departure from normal practice in the United States." Federal laws usually prevent the military from acting within the country. Although the president can call the military into action to help local governments after a natural disaster, its help is usually limited.
Some scholars believe the president has the executive power to declare martial law. Others believe the president needs congressional authorization to impose martial law in a civilian area. Therefore, Congress may be the only governmental branch that can legally declare martial law, and the president can only act according to its actions.
In order to invoke the Insurrection Act, a federal law enacted in 1807, the president must first issue a proclamation ordering any insurgents to disperse within a limited time. If the situation does not resolve itself, the president may issue an executive order to send in troops.
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Martial law and the US Constitution
Martial law is a somewhat vague legal term for when military authorities take control of civil governance and law enforcement. During martial law, the executive or military leaders may suspend certain civil liberties. It is intended to be reserved for times of extreme emergencies when existing civilian government and law enforcement have ceased to function or become ineffective.
The US Constitution does not define martial law, and it does not specify who can declare it. It also does not explicitly grant the president the power to declare martial law. The Constitution's drafters "made no express provision for the exercise of extraordinary authority because of a crisis." However, the modern interpretation allows the president and state officials to declare "degrees of martial law in specific circumstances."
Some scholars believe the president has the executive power to declare martial law. Others believe the president needs congressional authorization to impose martial law in a civilian area. Congress might be able to authorize a presidential declaration of martial law, but this has not been conclusively decided. State officials do have the power to declare martial law, but their actions under the declaration must abide by the U.S. Constitution and are subject to review in federal court.
Throughout American history, the federal and state governments have declared martial law over 60 times, with some sources citing a number as high as 68. There have been several instances where a president has declared martial law, including in times of war, natural disaster, and civic dispute. For example, President Franklin D. Roosevelt declared martial law in Hawaii after the attack on Pearl Harbor in 1941. President Abraham Lincoln also invoked martial law during the Civil War, although his declaration was Congressionally-imposed.
While the Insurrection Act is a federal law that allows the president to deploy military forces domestically to suppress insurrections, rebellions, or domestic violence, it is not the same as declaring martial law. The purpose of the Insurrection Act is to enforce the law, not replace it.
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Martial law and the suspension of habeas corpus
The concept of martial law is closely tied to the right of habeas corpus, which is the right of a person under arrest to appear in person before the court to ensure they are not being falsely accused. The US Constitution specifically protects this right in Article 1, Section 9: "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."
The suspension of habeas corpus is related to the imposition of martial law. While a declaration of martial law may be accompanied by a suspension of habeas corpus, they are distinct concepts. Suspending habeas corpus allows the government to detain and hold individuals without charge, but it does not imply an unusual role for the armed forces. On the other hand, martial law refers to instances when a nation's armed forces assume the governance of an area, suspending all local laws, civil authority, and sometimes local judiciaries.
The US Constitution does not define martial law and does not specify who can declare it. While the US President and US Congress have the power to impose martial law, it is unclear whether the president can legally declare it unilaterally. The Supreme Court has never explicitly stated that the president can declare martial law, and it has made inconsistent statements on the matter. Some scholars believe the president has the executive power to declare it, while others believe congressional authorization is required.
Throughout US history, martial law has been imposed at least 68 times, often in limited, local areas. Notable examples include the imposition of martial law in Hawaii following the Japanese attack on Pearl Harbor in 1941, and in San Francisco in 1934 due to "riots and tumult" resulting from a dock worker's strike.
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Martial law and the Insurrection Act
Martial law is the temporary imposition of military authority over designated civilian populations and territories, usually done to suppress civil disorder or rebellion. In the United States, the President has the power to institute martial law through the use of the Insurrection Act, which gives the President the authority to deploy the military within the United States to suppress civil disorder, insurrection, or rebellion.
The Insurrection Act, originally passed in 1807 and updated several times since, is a federal law that outlines the
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Instances of martial law in US history
In the United States, martial law refers to instances when a region, state, city, or the entire country is placed under military control. While the US President and Congress have the power to impose martial law, the President cannot act against the wishes of Congress in this regard. Martial law has been imposed at least 68 times in limited, usually local areas of the United States. Here are some notable instances of martial law in US history:
Boston, 1774:
In response to the Boston Tea Party, the British Parliament passed the Intolerable Acts, including the Massachusetts Government Act, which placed Boston under martial law. General Thomas Gage, the military governor, enforced measures such as closing the port and restricting town meetings to quell colonial resistance.
Virginia, 1775:
Lord Dunmore, the royal governor of Virginia, declared martial law on November 7, 1775, offering freedom to indentured servants and enslaved individuals who joined British forces against the rebelling colonists. This tactic aimed to disrupt the colonial labour force and gain support from enslaved people.
New Orleans, 1814-1815:
During the War of 1812, Gen. Andrew Jackson imposed martial law in New Orleans, Louisiana, from December 12, 1814, to March 13, 1815.
Kentucky, Maryland, and Missouri, 1863:
On September 15, 1863, President Abraham Lincoln imposed Congressionally authorised martial law on these three states during the Civil War. He suspended habeas corpus and civil rights, targeting prisoners of war, spies, draft dodgers, and those aiding the enemy.
Chicago, 1871:
Following the Great Chicago Fire of 1871, Chicago mayor Roswell B. Mason declared martial law and placed General Philip Sheridan in charge of the city on October 9, 1871.
Oklahoma, 1932:
Governor William "Alfalfa Bill" Murray declared martial law during a nonviolent dispute with oil producers over production limits. This case involved the use of military force but did not result in civilians being tried by a military tribunal.
Indiana, 1935-1936:
Governor Paul V. McNutt imposed martial law in Vigo County, Indiana, from July 22, 1935, to February 10, 1936, in response to a general strike. This was an unusual instance where the governor used martial law to end violence and force arbitration in a labour dispute.
Illinois, 1934:
Martial law was declared in Nauvoo, Illinois, during the Illinois Mormon War.
Utah, 1857-1858:
Governor Brigham Young declared martial law to resist approaching federal troops.
Hawaii, World War II:
Local military officials in Hawaii imposed martial law during World War II, which was later approved and expanded by President Franklin D. Roosevelt to include the incarceration of Japanese-Americans on the West Coast.
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Frequently asked questions
The U.S. Constitution does not explicitly grant the president the power to declare martial law. However, several presidents throughout history have done so.
Martial law refers to instances when a nation's armed forces step in and assume the governance of an area. Officials most often impose martial law when civilian authority over an area has stopped functioning, like in the case of an insurrection or natural disaster.
Martial law has been declared in the U.S. at least 68 times, according to the Brennan Center for Justice. Some examples include:
- New Orleans during the Battle of New Orleans
- San Francisco after the 1906 earthquake
- Hawaii after the attack on Pearl Harbor in 1941
- Kentucky, Maryland, and Missouri during the Civil War
Yes, martial law can be imposed when civil rule fails, temporarily being replaced with military authority in a time of crisis. However, it is considered a last resort as it could be easily abused as a political tool to control the population.











































