
In the United States, martial law has been declared a total of 68 times, with 29 of those instances being in response to labour disputes. Martial law is typically a last resort, as it can be easily abused as a political tool to control the population. While the U.S. Constitution does not explicitly state when a president can declare martial law, it is known that the President and Congress have the power to impose it, as they can be in charge of the militia. In nearly every state, the governor also has the power to impose martial law within the borders of the state.
| Characteristics | Values |
|---|---|
| Who can declare martial law? | The US President, the governor of a state, or a local military commander in limited emergencies. |
| What is martial law? | The use of the military for law enforcement. |
| When can martial law be declared? | In times of war or invasion, domestic war or insurrection, riot or civil unrest, labor dispute, natural disaster, or other emergencies. |
| How common is it? | It is a rare occurrence and has only been declared a limited number of times in the US. |
| What are the concerns? | Martial law could be abused as a political tool to control the population, especially political dissenters. |
| What are the legal considerations? | The US Constitution does not explicitly grant the President the power to declare martial law, and neither does it specifically forbid it. The Supreme Court has also never ruled on this issue. Most state constitutions, however, allow the governor or legislature to impose martial law. |
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What You'll Learn

Martial law can be declared by a US state governor
Martial law is a rare occurrence and is typically a last resort, as it could be easily abused as a political tool to control the population. While the U.S. Constitution does not explicitly define when a president can declare martial law, it also does not specifically forbid it. Similarly, the Constitution does not explicitly grant the president the power to declare martial law, and the Supreme Court has never ruled that the president or federal government can.
However, in nearly every state, the governor has the power to impose martial law within the borders of the state. This power is given to them either by the state constitution or the state legislature. State governors have historically declared martial law during times of labor unrest, insurrection, and civil unrest, although this is less common today. For example, in 1845, the governor of Illinois declared martial law in Nauvoo during the Illinois Mormon War. In 1931, the governor of Texas declared martial law in parts of East Texas due to what he called an insurrection.
The use of the military for law enforcement is not necessarily the same thing as implementing martial law. Federal troops can be used to enforce law and order without an official declaration of martial law. The Posse Comitatus Act, enacted in 1878, prohibits federal forces from assisting in domestic law enforcement unless the president has directed operations under the Insurrection Act or related laws.
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It can also be declared by the US president
While the US Constitution does not explicitly define when a president can declare martial law, it is generally accepted that the US president can declare martial law. However, the exact circumstances under which they can do so are unclear.
Some scholars argue that the president has the executive power to declare martial law, while others believe that congressional authorization is required for the president to impose martial law in a civilian area. In this view, Congress may be the only governmental branch that can legally declare martial law, and the president can only act according to its actions.
The Posse Comitatus Act, enacted by Congress in 1878, prevents the US military from participating in civilian law enforcement activities. This Act strengthens the separation of powers between Congress and the president and bolsters the concept of federalism, which divides power between federal and state governments.
The Insurrection Act of 1807 allows the president to deploy military forces to suppress rebellions within the US and assist local law enforcement in addressing domestic violence. In 1957, President Dwight D. Eisenhower invoked the Insurrection Act to enforce desegregation in Arkansas, and in 1992, the Act was invoked to control civilian violence and public unrest following a controversial court case in Los Angeles. However, it is important to note that calling in the National Guard is not the same as declaring martial law.
The US president's ability to declare martial law is a complex issue that has been the subject of scholarly debate and interpretation. Ultimately, while the president may have the power to declare martial law, it is a rare occurrence and is considered a last resort due to the potential for abuse as a political tool to control the population.
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Congress can also impose martial law
Congress can impose martial law, and has done so in the past, such as during the Civil War. The US Constitution does not define martial law and does not specify who can impose it. However, the modern interpretation allows the president and state officials to declare "degrees of martial law in specific circumstances".
Some scholars believe that the president has the executive power to declare martial law. Others argue that the president needs congressional authorization to impose it in civilian areas. Congress has the power to impeach a president for abuse of power, and it has several war powers that act as checks on the commander-in-chief. Congress also has the power to regulate the domestic deployment of the military and has passed legislation in this area.
Congress enacted the Posse Comitatus Act in 1878, which prevents the US military from participating in civilian law enforcement activities without congressional approval. This Act strengthens the separation of powers between Congress and the president. The US Constitution also states that habeas corpus can be suspended in cases of rebellion or invasion when public safety requires it.
In conclusion, while the power to declare martial law is not explicitly given to Congress, it does have several powers that impact the president's ability to declare it and has passed legislation regulating the military's involvement in civilian law enforcement.
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It has been used in response to labour disputes
In the United States, martial law has been used 29 times in response to labour disputes. It has been used to break strikes and lockouts by prohibiting them and appointing a party to decide the dispute. For example, in 1903, Colorado Governor James Peabody declared martial law in Cripple Creek and Telluride to break a peaceful strike by the Western Federation of Miners. The Colorado National Guard conducted mass arrests of striking workers, detaining them in open-air bull pens.
In 1914, martial law was imposed during the Colorado Coalfield War. The Colorado National Guard was called in to quell the strikers, but the situation escalated, and the proclamation of martial law by the governor resulted in the Ludlow Massacre.
In nearly every state, the governor has the power to impose martial law within the state's borders. However, declaring martial law is typically a last resort, as it could be easily abused as a political tool to control the population, especially political dissenters. It is considered an extraordinary remedy for emergencies and has been used sparingly in modern times.
In Thailand, martial law has been invoked recently, and it has had ramifications for labour disputes. Under Thai labour law, workers are legally entitled to strike, and employers are allowed to "lock out" employees. However, under martial law, the labour minister has the power to intercede in disputes by prohibiting strikes and lockouts and appointing a third party to resolve the dispute.
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Martial law has been used 11 times for civil unrest
Martial law is the temporary replacement of civilian government by military rule and the suspension of civilian legal processes in favour of military powers. It is usually invoked in times of war, rebellion, or natural disaster, and has been used 11 times for civil unrest in the United States.
In the US, martial law has been declared at least 60 times between the Civil War and the end of World War II. It has been used 11 times for civil unrest, seven times for domestic war or insurrection, five times to counter resistance to federal desegregation decrees in the South, twice for war or invasion, four times for natural disasters, 29 times for labour disputes, and 15 times for other reasons.
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 or state legislature grants this power. However, state officials' actions under a declaration of martial law must abide by the US Constitution and are subject to review in federal court.
Some examples of the use of martial law for civil unrest in the US include:
- Omaha race riot of 1919
- Lexington riots of 1920
- Illinois Mormon War, Nauvoo, Illinois, in 1845
- Utah War of 1857
- Cambridge riot of 1963
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Frequently asked questions
Yes, in nearly every state, the governor has the power to impose martial law within the borders of the state.
Martial law often refers to the use of the military for law enforcement. It is considered an extraordinary remedy for emergencies and has been declared in the US about 68 times, according to the Brennan Center for Justice.
A governor can declare martial law in limited emergencies or during times of insurrection, labour unrest, or civil unrest.











































