
Martial law is a controversial and complex topic with a long history. It occurs when the military assumes temporary control over various civilian authorities, often in response to insurrection, war, or natural disaster. While the US Constitution does not explicitly grant the president the power to declare martial law, several presidents and state governors have imposed or approved it throughout history. State officials, including governors, do have the power to declare martial law, and federal courts are likely to defer to their decisions. However, their actions under such a declaration must abide by the Constitution and are subject to review in federal court.
| Characteristics | Values |
|---|---|
| Who can declare martial law? | The Constitution does not define who can declare martial law. However, several presidents and many state governors have imposed or approved declarations of martial law throughout American history. |
| Can the president declare martial law? | The Constitution does not explicitly grant the president the power to declare martial law. The Supreme Court has never specifically ruled that the president or federal government can declare martial law. |
| Can the state governor declare martial law? | Almost all state constitutions allow the state governor or legislature to impose martial law. |
| What is martial law? | Martial law occurs when the military assumes temporary control over various civilian authorities. |
| When is martial law imposed? | 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. |
| What happens when martial law is imposed? | A military commander's authority under martial law is virtually unlimited. |
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What You'll Learn

The Posse Comitatus Act and the Insurrection Act
The Posse Comitatus Act is a United States federal law that limits the power of the federal government in the use of federal military personnel to enforce domestic policies within the United States. The Act, passed in 1878, prohibits federal troops from participating in civilian law enforcement unless expressly authorised by law. The law embodies an American tradition that views military interference in civilian affairs as a threat to both democracy and personal liberty. The Posse Comitatus Act was passed after the end of Reconstruction and the return of white supremacists to political power in southern states and Congress.
The Insurrection Act is the primary exception to the Posse Comitatus Act. The Insurrection Act grants the president the authority to deploy the US military domestically and use it against Americans under certain conditions. The Act allows the president to deploy military forces inside the United States to suppress rebellion or domestic violence or to enforce the law in certain situations. Invoking the Insurrection Act temporarily suspends the Posse Comitatus rule. The Insurrection Act has been invoked many times throughout American history, including during labour conflicts in the late 19th and early 20th centuries, and to enforce federally mandated desegregation in the 20th century.
The Posse Comitatus Act was passed in response to the military occupation of the former Confederate States by the US Army during the Reconstruction period following the American Civil War. The Act originally applied only to the US Army, but amendments have expanded its scope to include the Air Force, Navy, Marine Corps, and Space Force. The Coast Guard is not included in the Act as it has explicit statutory authority to perform law enforcement.
The Insurrection Act, originally enacted in 1792, has not been meaningfully updated since. While there are rare circumstances in which the authority granted by the Act may be necessary, the law is dangerously broad and susceptible to abuse. The Act fails to adequately define or limit when it may be used, giving the president significant discretion in deploying US military forces domestically. The Insurrection Act should, in theory, only be used in a crisis that is beyond the capacity of civilian authorities to manage.
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Martial law and the US Constitution
Martial law in the United States has a long and complex history, dating back to the colonial era. While the US Constitution does not explicitly define or grant the power to declare martial law, it gives Congress the authority to regulate the domestic deployment of the military. The Constitution Annotated notes that there are two competing theories regarding the source of the power to declare martial law: it either arises from the government's right and duty to "maintain public order" and keep the peace, or it is a power derived from "supreme political authority" during wartime.
Throughout American history, several presidents and state governors have imposed or approved declarations of martial law. Notably, the Posse Comitatus Act of 1878 and the Insurrection Act of 1807 impact the president's ability to declare martial law. The Posse Comitatus Act prevents the US military from participating in civilian law enforcement activities, while the Insurrection Act allows the president to deploy the military to put down rebellions and assist local law enforcement. The Insurrection Act is considered the primary exception to the Posse Comitatus Act.
State officials, including governors, have the power to declare martial law, particularly when authorized by state law. Federal courts are likely to defer to a state governor's decision to impose martial law if it is deemed necessary. This power is more clearly established at the state level, but there are significant limits. Actions taken under martial law must abide by the US Constitution and are subject to review in federal court.
The authority of a military commander under martial law is extensive, but it is not without limits. Court decisions and federal laws, such as the Posse Comitatus Act, restrict the military's involvement in civilian law enforcement. The exact scope of martial law remains unsettled due to sparse and confusing legal precedents.
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State governor's power to impose martial law
The power to impose martial law is not a straightforward issue in the United States. While the Constitution does not explicitly grant the US President the power to declare martial law, it is clear that state governors have the power to impose martial law within the borders of their state.
The Constitution does not define martial law, nor does it specify who can declare it. However, throughout history, several presidents and state governors have imposed or approved declarations of martial law. Notably, the Supreme Court has held that states can declare martial law, but it has never specifically held that the president can. This ambiguity has led to uncertainty about the legality of presidential declarations of martial law.
State governors have historically played a significant role in imposing martial law, particularly during the American Revolutionary period. For example, in 1774, General Thomas Gage, the military governor of Boston, enforced the Massachusetts Government Act, which effectively placed the city under martial law by restricting town meetings and port activities. Similarly, in 1775, Lord Dunmore, the royal governor of Virginia, issued a proclamation of martial law, offering freedom to those who joined the British forces against the rebelling colonists.
More recently, in 1963, Maryland Governor J. Millard Tawes imposed martial law in Cambridge for over a year to manage clashes between racial justice advocates and segregationists. This was the last time a state declared martial law. Additionally, in 1843, Joseph Smith, the founder of Mormonism, was able to escape arrest with the help of his followers and declare martial law in Nauvoo, Illinois, to protect the city from outside violence.
While state governors possess the power to impose martial law, it is essential to recognize that this power is not without limitations. The Posse Comitatus Act of 1878 prevents the US military from participating in civilian law enforcement activities, and federal courts are likely to scrutinize a state governor's decision to impose martial law.
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Martial law and federal courts
Martial law is a legal concept that allows military authorities to assume control and suspend certain civil liberties during times of crisis, particularly when national survival is at stake. The US Constitution does not explicitly authorize martial law, and the Supreme Court has never specifically ruled that the President or federal government can declare it. However, the Court has recognized it as an implicit element of the constitutional framework.
The Supreme Court's rulings on martial law at the federal level are limited and complicated. Because state martial law is more clearly outlined, federal courts are likely to defer to individual states for such decisions. The Posse Comitatus Act and the Insurrection Act are two federal laws that impact the President's ability to declare martial law. The former prevents the US military from participating in civilian law enforcement activities, while the latter allows the President to deploy military forces to put down rebellions and help local law enforcement.
State officials have the power to declare martial law, but their actions must abide by the US Constitution and are subject to review in federal court. Nearly every state allows the governor to impose martial law within the state's borders. This power has been used in response to violent civil unrest, natural disasters, and to break labor strikes.
The Supreme Court has addressed the legality of martial law through several landmark cases, affirming that while martial law can be permissible, it is subject to constitutional limitations. For example, in Ex parte Milligan, the Court ruled that President Lincoln's imposition of martial law by suspending habeas corpus was unconstitutional in areas where local courts were still in session.
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Historical instances of martial law
Martial law has been declared in various countries and regions throughout history, with the military assuming control from civilian authorities. Here are some notable instances of martial law:
United States:
- New Orleans, Louisiana (1866): Gen. Absalom Baird initially imposed martial law on July 30, 1866, with the ratification and extension of this decision carried out by Gen. Ulysses Grant.
- New York City (1776): Following the British capture of the city in September 1776, martial law was imposed to restore order and assert British authority.
- Boston (1774): In response to the Boston Tea Party, the British Parliament passed the Intolerable Acts, with the Massachusetts Government Act placing Boston under martial law by closing its port and restricting town meetings.
- Virginia (1775): Lord Dunmore, the royal governor, issued a proclamation declaring martial law and offering freedom to indentured servants and enslaved individuals who joined British forces against the rebelling colonists.
- New Orleans, Louisiana (1814): During the War of 1812, General Andrew Jackson imposed martial law in New Orleans. He imposed strict curfews and travel restrictions on all residents and declared that anyone challenging his authority would be considered a spy or traitor.
- Rhode Island (1842): The Rhode Island General Assembly declared martial law, marking one of the few instances where a state legislature has done so.
- Oklahoma (1930s): Governor William Murray declared martial law at least 6 times, and possibly more than 30 times, during his tenure.
- Vigo County, Indiana (1935-1936): Governor Paul V. McNutt declared martial law in response to the General Strike of 1935, using it to end the violence and force arbitration.
- Utah Territory (1857-1858): Governor Brigham Young declared martial law to facilitate armed resistance to approaching federal troops.
- Nationwide (1860s): President Abraham Lincoln imposed martial law in border states between the North and South during the Civil War.
- Nationwide (1940s): Local military officials in Hawaii imposed martial law during World War II, which was later approved and expanded by Franklin Roosevelt to include the incarceration of Japanese-Americans on the West Coast.
Other countries and regions:
- Tasmania (1828-1832): Lieutenant-Governor George Arthur declared martial law during the Black War, a period of violent conflict between British colonists and Aboriginal Australians. This provided legal immunity for killing Aboriginal people and was the longest period of martial law in the history of British colonies in Australia.
- Pakistan (1977): General Muhammad Zia-ul-Haq imposed total martial law, overthrowing Zulfikar Ali Bhutto, who had previously imposed selective martial law in areas hostile to his rule.
- Philippines, Mindanao (2017): President Rodrigo Duterte declared martial law throughout the main southern island due to attacks by the Maute Group.
- Azerbaijan (2020): President Ilham Aliyev declared martial law during the 2020 Nagorno-Karabakh war.
- Bahrain (2011): King Hamad bin Isa Al Khalifa declared martial law during an anti-government uprising, granting the police and military authority to crack down on protesters.
- China (1949-1987): After the Nationalist-led central government of China lost control of the mainland to the Chinese Communist Party, they retreated to Taiwan and imposed martial law to suppress Communist activities.
- Egypt (1967-2021): States of emergency were in effect almost continuously, giving military courts the power to try civilians and the government the authority to detain those deemed threats without court orders.
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Frequently asked questions
Yes, state governors can impose martial law. In fact, almost all state constitutions allow the state governor or legislature to impose martial law.
The US Constitution does not give the President the power to impose martial law. However, the President does have the authority to deploy troops to assist civilian law enforcement.
Martial law occurs when the military assumes temporary control over various civilian authorities. It is often imposed when civilian authority over an area has stopped functioning, such as in the case of an insurrection or natural disaster.
Yes, martial law has been imposed several times in US history. For example, General Andrew Jackson imposed martial law in New Orleans during the War of 1812, and Joseph Smith declared martial law in Nauvoo, Illinois, in 1843.





































