
Martial law is a complex and elusive legal concept that involves the temporary substitution of civilian rule with military authority, typically during emergencies, wars, rebellions, or natural disasters. While the military can be called upon to assist during such events, it does not always equate to the implementation of martial law. In the United States, the authority to impose martial law rests with the President, Congress, or a local military commander under specific circumstances. However, the Posse Comitatus Act prohibits the US military from engaging in domestic law enforcement without congressional approval, creating a delicate balance between civilian authority and military involvement. This topic raises questions about the limits of presidential power, the role of the military, and the protection of constitutional rights, even in times of crisis.
| Characteristics | Values |
|---|---|
| Who can declare martial law in the US | The US President, Congress, or a local military commander |
| Who cannot declare martial law in the US | The US President, according to some sources |
| Who can impose martial law | The US President, Congress, a State governor, or in limited emergencies, a local military commander |
| Who can refuse martial law | Congress, by not providing approval |
| Who has imposed martial law in the past | The British Parliament, Lord Dunmore (royal governor of Virginia), the US military, General Andrew Jackson, King Hamad bin Isa Al Khalifa, Chief Martial Law administrators in Bangladesh, the Indonesian Army Chief, and others |
| Who has the power to impose martial law | Nearly every US state has a constitutional provision authorizing the government to impose martial law |
| Limitations of martial law | Martial law is limited by several court decisions handed down between the American Civil War and World War II |
| Legal status of martial law | The law surrounding martial law is complicated and unsettled; there is no universal definition of martial law |
| Legal precedents | The Insurrection Act and the Posse Comitatus Act |
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What You'll Learn

Martial law in the United States
In the United States, martial law may be declared by proclamation of the President or a State governor, but such a formal proclamation is not necessary. Although the U.S. Constitution makes no specific provision for the imposition of martial law, nearly every State has a constitutional provision authorizing the government to impose it. On a national level, both the US President and the US Congress have the power, within certain constraints, to impose martial law since both can be in charge of the militia. In nearly every state, the governor has the power to impose martial law within the borders of the state.
Throughout history, martial law has been imposed at least 68 times in limited, usually local areas of the United States. It has been declared twice for war or invasion, seven times for domestic war or insurrection, eleven times for riot or civil unrest, 29 times for labor dispute, four times for natural disaster, and fifteen times for other reasons.
Martial law was imposed in New Orleans during the Battle of New Orleans, after major disasters such as the Great Chicago Fire of 1871, and during riots such as the Omaha race riot of 1919. It has also been imposed during times of civil unrest, such as in Utah during the Utah War, and in response to chaos associated with protests and rioting, such as the 1934 West Coast waterfront strike.
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The Posse Comitatus Act
While the Posse Comitatus Act prohibits the use of the military in civilian law enforcement, there are statutory exceptions that allow the president to use the military to suppress rebellions, enforce federal civil rights laws, and protect a group of people's civil rights when the state government is unable or unwilling to do so. These exceptions are outlined in the Insurrection Act and the Enforcement Acts, which have been invoked in various instances throughout history, such as during the 1957 school desegregation crisis in Little Rock, Arkansas.
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Martial law and civil liberties
Martial law is a complex and elusive legal concept that has been invoked in various ways throughout history. It refers to the temporary substitution of civilian government by military rule, typically during emergencies such as war, rebellion, civil unrest, or natural disasters. While there is no universal definition, it often involves the suspension of standard civil liberties and the military's involvement in law enforcement.
In the United States, the imposition of martial law is limited by historical court decisions and acts such as the Posse Comitatus Act, which prohibits US military involvement in domestic law enforcement without congressional approval. The US Constitution does not specifically address martial law, and the Supreme Court has not provided a clear determination of the federal government's power to declare it. However, the US President, Congress, or a local military commander may impose degrees of martial law under specific situations.
The history of martial law in the US demonstrates the tension between military authority and civil liberties. For example, during the War of 1812, General Andrew Jackson imposed martial law in New Orleans, justifying his actions by claiming that the civilian government had ceased to function due to an impending British attack. Jackson's actions included strict curfews, travel restrictions, and the imprisonment of those who challenged his authority, including judges who ruled against him.
Another notable instance of martial law in the US occurred in Hawaii during World War II, following the Japanese attack on Pearl Harbor in 1941. This period saw the involvement of the military in civilian law enforcement, such as the arrest of a stockbroker, Harry White, by military police for embezzlement of funds, which would typically be a civilian matter.
While martial law can provide stability and enforce rule during emergencies, it also raises concerns about the protection of civil liberties. The suspension of habeas corpus, which guarantees the right to a hearing and trial on lawful imprisonment, is a significant issue associated with martial law. The balance between maintaining public order and preserving individual freedoms is a delicate one, and the imposition of martial law must be carefully considered and reviewed to ensure that it does not infringe upon constitutional rights.
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Martial law and the Supreme Court
Martial law is the temporary replacement of civilian government by military rule and the suspension of civilian legal processes for military powers. In the United States, martial law has been used in a limited number of circumstances, such as during the Whiskey Rebellion, when President Lincoln suspended habeas corpus in 1861 to arrest one-third of the Maryland state assembly.
The Supreme Court has ruled that martial law is permissible but insists on certain limits on its use. The Court's decisions indicate that military authority is not absolute and must align with constitutional principles, especially when civilian courts are operational. The application of martial law can differ significantly between federal and state jurisdictions, with individual states often having clearer guidelines for its implementation.
In Ex parte Merryman (1861), Chief Justice Roger Brooke Taney concluded that Lincoln's suspension of the writ was illegal. Lincoln never formally responded to the charge, but he continued to issue orders suspending the writ. In Ex parte Vallandigham (1864), the Supreme Court effectively upheld the military's decision to arrest and try Clement Vallandigham, who then applied to the Court for a writ of habeas corpus. The Court concluded that it did not have the authority to issue the writ to military authorities, thus leaving undisturbed the system of martial law Lincoln had imposed.
In Ex parte Milligan, 71 US 2 (1866), the Supreme Court ruled that Lincoln's imposition of martial law (by way of suspension of habeas corpus) was unconstitutional in areas where the local courts were still operational. In his opinion for the Court, Justice Hugo L. Black wrote that “our system of government [is] clearly [...] the antithesis of total military rule.”
During the War of 1812, General Andrew Jackson imposed martial law in New Orleans. When district and federal judges ruled against his actions, Jackson imprisoned them.
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Martial law in times of civil unrest
Martial law is the temporary substitution of civilian authority with military rule and is usually invoked during times of war, rebellion, coup d'état, or natural disaster. It can also be declared in response to civil unrest, as seen in Thailand in 2006 and 2014, Egypt in 2013, and China during the Tiananmen Square protests in 1989. In the United States, martial law has been imposed 68 times, with 29 of those instances involving labor disputes and 11 involving civil unrest.
The decision to impose martial law often lies with the head of state, such as the president or monarch, or a regional authority, such as a state governor. In the United States, both the President and Congress have the power to impose martial law, and in nearly every state, the governor holds this power within their respective state borders.
When martial law is in effect, military commanders are granted virtually unlimited authority to make and enforce laws, including the suspension of civil liberties and the substitution of military tribunals for civilian courts. However, civilians cannot be tried by military courts as long as civilian courts remain functional. Standard law enforcement procedures may be suspended, and military forces may engage in direct or indirect support roles, with direct support involving physical contact with offenders and indirect support providing logistics, transportation, and training assistance.
Martial law is often viewed as a controversial measure due to its potential infringement on civil liberties and the replacement of civilian governance with military rule. In the United States, the Posse Comitatus Act of 1878 prohibits federal forces from assisting in domestic law enforcement without congressional approval, serving as a check on the imposition of martial law.
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Frequently asked questions
Martial law is the temporary replacement of civilian government by military rule and the suspension of civilian legal processes for military powers. It is usually invoked in times of war, rebellion, or natural disaster.
Martial law is usually declared by the president, Congress, or a local military commander. The U.S. military, when allowed to act domestically, is ordinarily limited to assisting civilian authorities. However, the Posse Comitatus Act of 1878 forbids US military involvement in domestic law enforcement without congressional approval. Therefore, the military can refuse to enforce martial law if it involves civilian law enforcement and does not have congressional approval.
When martial law is in effect, the military commander of an area or country has unlimited authority to make and enforce laws. Standard civil liberties may be suspended, and laws are enforced by soldiers rather than local police. Martial law declarations are subject to judicial review, and individuals detained by the military can ask a federal court to order their release by petitioning for a writ of habeas corpus.


























