
Martial law is a rarely used term that refers to when the military takes over from civilian government in an emergency. In the US, the president does not have the authority to declare martial law, and it has not been declared since 1944 in Hawaii. However, martial law can be declared by state governors in certain circumstances, such as in 1963 when Maryland Governor J. Millard Tawes imposed it in response to clashes between racial justice advocates and segregationists. With this in mind, it is possible that martial law could be declared after an election, but it would depend on the specific circumstances and the relevant state laws.
| Characteristics | Values |
|---|---|
| Who can declare martial law? | Not the president. |
| When can martial law be declared? | In an emergency, allowing the military to push aside civilian authorities and exercise jurisdiction over the population of a particular area. |
| What happens during martial law? | The military takes the place of civilian government. Laws are enforced by soldiers, and policy decisions are made by military officers. |
| Where does martial law apply? | Confined to the locality of active military operations or actual war. |
| How long can martial law last? | Martial law can last until courts are reinstated. Continuing martial law after the courts are reinstated is a gross usurpation of power. |
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What You'll Learn
- Martial law is declared when civil war or foreign invasion closes the courts
- The military can take over civilian government in an emergency
- The President cannot declare martial law
- Martial law was last declared at the state level in 1963
- The military can assist civilian authorities with law enforcement. This has been abused in the past

Martial law is declared when civil war or foreign invasion closes the courts
Martial law is a temporary substitution of military authority for civilian rule. It is usually invoked in times of war, rebellion, or natural disaster. In the United States, martial law may be declared by the President or a State governor, but a formal proclamation is not necessary. While the US Constitution does not specifically address the imposition of martial law, nearly every state has a constitutional provision authorizing the government to impose it.
In another instance, President Lincoln imposed Congressionally authorized martial law on Kentucky, Maryland, and Missouri during the Civil War. He suspended habeas corpus and civil rights, applying them to "prisoners of war, spies, or aiders and abettors of the enemy," as well as draft dodgers. However, the Supreme Court later ruled that Lincoln's imposition of martial law by suspending habeas corpus was unconstitutional in areas where local courts were still operational.
It's important to note that martial law is intended to be temporary and limited to the locality of actual war. It is justified when civilian authority has ceased to function or become ineffective. In the case of closed courts due to civil war or foreign invasion, martial law can be declared to preserve the safety of the army and society until the courts can be reinstated and the free course of law can resume.
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The military can take over civilian government in an emergency
In the United States, martial law refers to the temporary substitution of military authority for civilian rule, usually invoked in times of war, rebellion, or natural disaster. Martial law is justified when civilian authority has ceased to function, is completely absent, or has become ineffective. While the U.S. Constitution does not make a specific provision for the imposition of martial law, nearly every state has a constitutional provision authorizing the government to impose it. Martial law can be declared by proclamation of the President or a State governor, but a formal proclamation is not necessary.
The term "martial law" has no established definition, but it generally refers to the military taking over the role of civilian government in an emergency. The Insurrection Act, enacted in 1792, grants the President the authority to deploy the U.S. military domestically and use it against Americans under certain conditions. However, the Act does not authorize martial law. Instead, it permits the military to assist civilian authorities, not take their place. Under current law, the President does not have the authority to declare martial law.
The Posse Comitatus Act, enacted in 1878, generally prevents the President from using the military as a domestic police force. The Act forbids the U.S. military, including federal armed forces and National Guard troops, from taking part in civilian law enforcement unless expressly authorized by law. The Posse Comitatus Act reflects the American value that military interference in civilian government is a threat to democracy and personal liberty. However, there are exceptions to the Posse Comitatus Act that allow the President to use the military to suppress rebellions and enforce federal civil rights laws.
In recent years, there have been concerns about the vague and outdated nature of the Insurrection Act, which has not been meaningfully updated in over 150 years. The Act has been invoked numerous times throughout American history, including by Presidents George Washington, John Adams, Abraham Lincoln, and Ulysses Grant. In the 21st century, there are calls for Congress to amend the Act to define more clearly the situations that may trigger its use and to establish review mechanisms to guard against abuse.
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The President cannot declare martial law
The President of the United States does not have the authority to declare martial law. The Constitution does not define martial law, nor does it specify who can declare it. It does not grant the president conclusive and preclusive authority over the domestic use of the military. Instead, it explicitly vests power in the legislative branch, and the president cannot act against Congress's wishes in this area.
While the president can deploy troops to enforce the law in specific situations, such as after a natural disaster, and has, in the past, imposed martial law, the Supreme Court has never specifically held that the president can declare martial law. The modern interpretation allows the president and state officials to declare "degrees of martial law in specific circumstances," but it is unclear whether the president can legally make such a declaration independently.
Some scholars believe the president has the executive power to declare martial law, while others believe congressional authorization is required. In the absence of the Posse Comitatus Act and other laws regulating domestic military activity, the president could rely on some independent executive power to declare martial law, but this scenario is hypothetical, and the likely legal outcome is uncertain.
The imposition of martial law is closely tied to the right of habeas corpus, which is the right to a hearing and trial on lawful imprisonment. 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." While the president can suspend habeas corpus, the Supreme Court has ruled that the imposition of martial law by way of suspension of habeas corpus is unconstitutional in areas where the local courts are still in session.
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Martial law was last declared at the state level in 1963
In the United States, martial law has been used in a limited number of circumstances. For instance, martial law was declared in New Orleans during the Battle of New Orleans, after the Great Chicago Fire of 1871, and following the 1906 San Francisco earthquake. It has also been declared during riots and civil unrest, such as the Omaha race riot of 1919, the 1920 Lexington riots, and the Civil Rights Movement in the 1960s.
At the state level, martial law was last declared in 1963 in Cambridge, Maryland, by Governor J. Millard Tawes. It was imposed for over a year in response to violent clashes between racial justice advocates and segregationists. This was the last time martial law was declared at the state level, and it has not been used in the United States since. While the power to declare martial law still exists, it is poorly understood and the legal questions surrounding it remain unanswered.
Martial law can be used by governments to enforce their rule over the public and is often declared in response to a necessity for order rather than a legal right. While some countries have explicit provisions permitting martial law, others do not. In countries without explicit permission, the legal justification for declaring martial law is often based on the common law doctrine of necessity.
In the United States, both the President and Congress have the power to impose martial law, as they can be in charge of the militia. Additionally, in nearly every state, the governor has the authority to impose martial law within their state's borders. However, their actions under such a declaration must abide by the US Constitution and are subject to review in federal court.
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The military can assist civilian authorities with law enforcement. This has been abused in the past
The Posse Comitatus Act is a federal law in the United States that prohibits the use of federal military personnel in civilian law enforcement. The law was enacted in 1878 as an amendment to an army appropriation bill following the end of the Reconstruction era. It reflects a core American value that military interference in civilian affairs poses a threat to democracy and personal liberty.
However, there are exceptions to the Posse Comitatus Act that allow the military to assist civilian authorities. The Insurrection Act, enacted in 1792, grants the president the authority to deploy the military domestically and use it for civilian law enforcement under certain conditions. This includes suppressing rebellion or domestic violence and enforcing federal court orders. The Military Cooperation with Civilian Law Enforcement Agencies Act, enacted in 1981, also clarifies permissible military assistance to domestic law enforcement agencies, particularly in combating drug smuggling.
Despite these exceptions, the Posse Comitatus Act has been abused in the past. For example, in 1987, Delta Force soldiers were deployed during the Atlanta prison riots to serve as sniper/observer teams, provide medical support, gather intelligence, and conduct assistance in explosive breaching. In 2009, members of the U.S. Army Military Police Corps were deployed to Samson, Alabama, in response to a shooting spree without authorisation from the governor or president, violating the Posse Comitatus Act.
The lack of clear standards within the Insurrection Act has created a situation where the president has almost limitless discretion to deploy federal troops in cases of civil unrest, which is dangerous and unnecessary in the 21st century. There are also loopholes in the Posse Comitatus Act, such as the exclusion of the District of Columbia National Guard, that need to be addressed by Congress.
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Frequently asked questions
No, the president does not have the authority to declare martial law.
Martial law refers to when the military takes the place of the civilian government in an emergency. The military enforces laws and makes policy decisions instead of local police and elected officials.
Yes, the federal government last declared martial law in 1944 when civilian rule was restored in Hawaii. At the state level, martial law was last declared in 1963 in the city of Cambridge, Maryland.
During World War II, the military governed everyday life in Hawaii. The army controlled all aspects of life, from criminal justice to parking zones and trash removal.











































