
In the United States, state governors have the power to impose martial law within the borders of their state. This power is derived from the state constitution or the state legislature. Martial law involves the temporary substitution of military authority for civilian rule and is typically a last resort during times of war, rebellion, or natural disaster. It has been used in the past to protect against mob violence and control labour disputes. The Supreme Court has never specifically ruled on the president's power to declare martial law, and it has not been declared federally since 1944.
| Characteristics | Values |
|---|---|
| Who can declare martial law? | The US President, US Congress, or State Governor. |
| How is it declared? | By proclamation, although this is not necessary. |
| Where does the power to declare martial law come from? | The US Constitution does not explicitly grant this power, but nearly every state has a constitutional provision authorizing the government to impose it. |
| What is martial law? | The temporary substitution of military authority for civilian rule. |
| When is it declared? | In times of war, rebellion, or natural disaster, or to maintain public order. |
| How often has it been declared? | At least 68 times in limited, local areas of the US. |
| Can civilians be tried by military tribunals under martial law? | Yes, but only if civilian courts are non-functional. |
| What is the authority of a military commander under martial law? | Unlimited authority to make and enforce laws. |
| What are the limitations of martial law? | The Constitution and valid federal laws will still constrain states' conduct. |
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What You'll Learn
- Martial law has been declared by state governors during times of labour unrest
- State constitutions allow governors to impose martial law
- Martial law is a temporary substitution of military authority for civilian rule
- Martial law has been used in the US at least 68 times
- Martial law can be used to control political dissenters

Martial law has been declared by state governors during times of labour unrest
Martial law is a vague term referring to the use of the military for law enforcement. It is typically a last resort as it can be easily abused as a political tool to control the population, especially political dissenters. The U.S. Constitution does not explicitly define when a president can declare martial law, nor does it specifically forbid it.
State governors have the power to impose martial law within the borders of their state, and they have done so during times of labour unrest. For example, in 1892, striking mineworkers in Coeur d'Alene, Idaho, blew up a mill and shot at strike-breaking workers. The governor declared martial law, and over 600 people were arrested. In another instance, Joseph Smith, the founder of Mormonism, was charged with causing a riot in Nauvoo, Illinois, and he too declared martial law.
In nearly all states, the governor has the power to impose martial law, a power given to them by the state constitution or the state legislature. Martial law has been declared nine times since World War II and, in five instances, was designed to counter resistance to federal desegregation decrees in the South.
The Insurrection Act of 1807 allows the president to deploy military forces domestically to suppress insurrections, rebellions, or domestic violence. This law has been invoked multiple times, including by President Dwight D. Eisenhower to enforce desegregation in Arkansas in 1957 and in 1992 to control civilian violence and public unrest following the acquittal of police officers in the beating of Rodney King.
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State constitutions allow governors to impose martial law
The imposition of martial law involves the temporary substitution of military authority for civilian rule and is usually invoked during war, rebellion, or natural disaster. When martial law is in effect, military commanders have virtually unlimited authority to make and enforce laws, suspend existing laws, and override civil authority. However, there are some limitations, such as the prohibition of trying civilians in military tribunals as long as civilian courts are functional.
Throughout history, state governors have declared martial law during times of labor unrest, civil unrest, and natural disasters. For example, in 1871, the governor of Illinois declared martial law in Nauvoo, Illinois, during the Illinois Mormon War. In 1892, the governor of Idaho declared martial law in response to a violent strike by mineworkers. More recently, in 1963, the governor of Maryland imposed martial law in Cambridge for over a year due to clashes between racial justice advocates and segregationists.
While state constitutions allow governors to impose martial law, there are significant limits to this power. State declarations of martial law are subject to the U.S. Constitution and valid federal laws, and federal courts can review these decisions. However, the exact scope and limits of martial law remain unclear due to sparse and inconsistent Supreme Court precedents and a lack of specific legislation.
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Martial law is a temporary substitution of military authority for civilian rule
In nearly every state, the governor has the power to impose martial law within the borders of the state, and in almost all states, the state constitution allows the state governor or legislature to impose martial law. State governors have historically declared martial law during times of labor unrest, civil unrest, and natural disasters. For example, in 1933, Georgia Governor Eugene Talmadge declared martial law to force out some commissioners of the state Highway Board, whom he had no legal power to remove. In another instance, Governor William "Alfalfa Bill" Murray of Oklahoma is said to have declared martial law more than 30 times during his tenure.
The power of martial law, once considered nearly absolute, now has limitations. For example, civilians may not be tried by military tribunals as long as civilian courts are functional. The imposition of martial law is a highly controversial issue, as it could be easily abused as a political tool to control the population, especially political dissenters.
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Martial law has been used in the US at least 68 times
In the United States, martial law has been imposed at least 68 times, according to the Brennan Center. This involves the military taking over from civilian authorities, and it is usually invoked during war, rebellion, or natural disaster.
The US Constitution does not specify when martial law can be declared, but it does not forbid it. The power to declare martial law typically rests with the US President or a State governor, although a formal proclamation is not always necessary. In nearly every state, the governor can impose martial law within the state's borders.
Martial law has been declared nine times since World War II. In five of these instances, it was to counter resistance to federal desegregation decrees in the South. For example, President Dwight D. Eisenhower invoked the Insurrection Act to enforce desegregation in Arkansas in 1957. However, he did not declare martial law.
Historically, martial law has been used in limited circumstances. For instance, it was declared in New Orleans during the Battle of New Orleans, and after major disasters, such as the Great Chicago Fire of 1871 and the 1906 San Francisco earthquake. It has also been declared during riots, such as the Omaha race riot of 1919 and the 1920 Lexington riots. Local leaders also declared martial law to protect themselves from mob violence, as seen in Nauvoo, Illinois, during the Illinois Mormon War, and in Utah during the Utah War.
In 1871, Chicago mayor Roswell B. Mason declared martial law after the Great Chicago Fire, placing General Philip Sheridan in charge of the city. Martial law was lifted within a few days, as there were no widespread disturbances after the fire was extinguished.
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Martial law can be used to control political dissenters
In the United States, martial law involves the temporary substitution of military authority for civilian rule. It is usually invoked in times of war, rebellion, or natural disaster. When martial law is in effect, the military commander of an area or country has unlimited authority to make and enforce laws. This means that martial law can be used to control political dissenters.
Historically, martial law has been imposed at least 68 times in limited, usually local areas of the United States. In nearly every state, the governor has the power to impose martial law within the borders of the state. For example, in 1871, Chicago mayor Roswell B. Mason declared a state of martial law in response to the Great Chicago Fire. In 1892, the governor of Idaho declared martial law after striking mineworkers blew up a mill and shot at strike-breaking workers. More recently, state governors have declared martial law during times of labor unrest.
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. For example, during the Civil War, President Abraham Lincoln's administration declared martial law in several states to combat Union dissenters. The Insurrection Act, enacted in 1807, also allows the president to deploy military forces domestically to suppress insurrections, rebellions, or domestic violence.
While martial law can be used to maintain order and protect civilians during times of crisis, it is important to recognize that it can also be abused as a political tool to control the population, including political dissenters. The power of martial law, once held to be nearly absolute, has limitations. For example, civilians may not be tried by military tribunals as long as civilian courts are functional.
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Frequently asked questions
Yes, state governors can declare martial law. In fact, it has been imposed at least 68 times in limited, usually local areas of the United States.
Martial law involves the temporary substitution of military authority for civilian rule and is usually invoked in times of war, rebellion, or natural disaster.
When martial law is in effect, the military commander of an area or country has unlimited authority to make and enforce laws. Martial law suspends all existing laws, as well as civil authority and the ordinary administration of justice.
The US Constitution does not explicitly grant the President the power to declare martial law. However, both the President and Congress can impose martial law since they can be in charge of the militia.























