
Martial law is a dramatic departure from normal practice in the United States. It refers to instances when a nation's armed forces assume the governance of an area. The Constitution of the United States does not define martial law and does not specify who can impose it. While the Supreme Court has held that states can declare martial law, it has never explicitly held that the president can. Several presidents have declared martial law throughout history, and it is often imposed when civilian authority over an area has stopped functioning, such as in the case of an insurrection or natural disaster. However, it is still unclear whether the president has the legal authority to declare martial law.
| Characteristics | Values |
|---|---|
| Number of times martial law has been declared in the U.S. | 68 |
| Instances of martial law being declared in the U.S. | New Orleans during the War of 1812; Nauvoo, Illinois, during the Illinois Mormon War; Utah during the Utah War; Omaha in 1919; Hawaii after the attack on Pearl Harbor; Chicago in 1871; Kentucky, Maryland, and Missouri in 1863; San Francisco in 1906; Lexington in 1920; West Coast in 1934; Cambridge in 1963 |
| Reasons for declaring martial law | War or invasion; domestic war or insurrection; riot or civil unrest; labor dispute; natural disaster; violent conflict; state of emergency; uprising; public demonstrations; military activity |
| Branches of government that can declare martial law | The president, Congress, or a local military commander |
| Branches of government that have declared martial law | The president, Congress, state governors, local military commanders, and local leaders |
| Legal authority to declare martial law | The Constitution does not specify who can declare martial law; modern interpretation allows the president and state officials to declare "degrees of martial law in specific circumstances"; some scholars believe the president has executive power to declare martial law, while others believe congressional authorization is needed |
| Powers during martial law | Military commander has virtually unlimited authority to govern an area; local laws, civil authority, and judiciaries are suspended; temporary laws and military tribunals are put in place |
| Legal challenges to martial law | Supreme Court has ruled that the imposition of martial law by suspension of habeas corpus was unconstitutional in areas where local courts were still in session; nearly every instance of active-duty troops being mobilized for law enforcement has faced backlash; several Supreme Court cases interpreting the use of martial law |
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What You'll Learn

To suppress civil unrest
The US Constitution does not define martial law, nor does it specify who can declare it. However, it has been declared in the US about 68 times, with 33 separate legal challenges to these declarations. Martial law has been used to suppress civil unrest in the form of riots, civil rights movements, and labour disputes. For example, in 1932, President Herbert Hoover ordered the military to clear protesting veterans and their families from an encampment near the US Capitol.
In 1963, local leaders declared martial law to protect themselves from mob violence during the Civil Rights Movement in response to the Cambridge riot. Similarly, in 1944, President José P. Laurel placed the Philippines under martial law to suppress increasing civil strife and the threat of a communist takeover. In 1978, in response to public demonstrations protesting the death of Mostafa Khomeini, Shah Mohammad Reza Pahlavi effectively declared martial law on the capital of Tehran and several other cities.
In the US, the president, Congress, or a local military commander may impose degrees of martial law under specific situations. However, it is debated whether the president has the authority to declare martial law independently. Some scholars believe the president has the executive power to declare martial law, while others believe congressional authorization is needed. Congress might be able to authorize a presidential declaration of martial law, but this has not been conclusively decided.
Although the president can call on the military to help local governments after a natural disaster, federal laws usually prevent the military from acting within the country. When martial law is declared, local laws, civil authority, and sometimes local judiciaries are suspended, and the military commander gains virtually unlimited authority to govern an area.
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To protect against invasion
While the U.S. Constitution does not define martial law, it is generally understood as a power that allows the military to take over the role of civilian government in an emergency. In the United States, martial law has been declared nine times since World War II, and in five instances, it was used to counter resistance to federal desegregation decrees in the South.
The U.S. Constitution does not explicitly grant the President the power to declare martial law. The President's authority to declare martial law unilaterally is further limited by the Posse Comitatus Act, which regulates the domestic use of the military. The Commander in Chief Clause also does not enable the President to unilaterally declare martial law, as it only grants authority to the federal government as a whole and allows unilateral federal action in the case of invasion.
However, the Insurrection Act authorizes the President to deploy military forces inside the United States to suppress rebellion, domestic violence, or to enforce the law in certain situations. This Act is the primary exception to the Posse Comitatus Act. Additionally, Articles I and II of the Constitution give both Congress and the President some control over America's military forces, with Article II, Section 2, stating that the "President shall be Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States."
In the case of an invasion, the Guarantee Clause requires the United States to "protect each [state] against Invasion." This clause grants authority to the federal government as a whole and allows unilateral federal action in the event of an invasion. Therefore, while the President may have some authority to act in response to an invasion, the declaration of martial law would require the involvement and authorization of Congress, as the Constitution vests power in the legislative branch regarding the domestic use of the military.
Historically, there have been instances where martial law was declared or approved by the President to protect against invasion. For example, in 1941, Hawaii was placed under martial law following the Japanese attack on Pearl Harbor, and President Franklin D. Roosevelt approved the declaration. Additionally, Andrew Jackson imposed martial law on New Orleans to defend against a British invasion, justifying his actions by arguing that the military was the only body able to protect the city as the government had ceased to function due to the impending attack.
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To respond to natural disasters
Martial law can be declared by a president in response to natural disasters when the situation exceeds the capacity of state and local authorities to respond. This can include scenarios such as massive hurricanes, earthquakes, floods, or any other catastrophic events that result in widespread damage, disruption, and loss of life. The purpose of declaring martial law in these situations is to provide additional resources, establish order, and expedite the relief and recovery process.
When a natural disaster strikes, local and state authorities are usually the first responders, providing emergency services, coordinating rescue efforts, and maintaining public order. However, in certain situations, the scale of the disaster may overwhelm their capabilities, making it necessary for the federal government to intervene. By declaring martial law, the president can deploy federal troops, coordinate military assistance, and establish a temporary military authority to oversee the affected areas.
The presence of military personnel during martial law provides several advantages in disaster response. They can assist in enforcing curfews and controlling access to disaster zones, preventing looting, and ensuring the safety of residents and property. The military can also provide crucial logistical support, including setting up temporary housing, distributing food and supplies, and assisting in search and rescue operations. Their resources, such as helicopters, trucks, and engineering equipment, can be vital in reaching and assisting affected areas that may be cut off or difficult to access.
Additionally, martial law can help streamline the decision-making process during critical situations. The chain of command within the military hierarchy allows for quick and efficient execution of orders, which is crucial in disaster response when timely action is required. The centralized command structure can facilitate coordination between various agencies and organizations involved in the relief efforts, ensuring a more cohesive and effective response.
It is important to note that the declaration of martial law in response to natural disasters should be temporary and limited in scope. Once the immediate crisis has passed and local authorities can effectively manage the situation, the military presence should be withdrawn, and normal civilian control should be restored. The goal is to utilize martial law as a tool to provide swift and efficient disaster relief while minimizing any potential infringement on the rights and freedoms of the affected population.
In conclusion, a president may declare martial law in response to catastrophic natural disasters. This action provides additional resources, establishes order, and expedites relief efforts. Martial law empowers the federal government to deploy troops, coordinate military assistance, and establish temporary military authority. The benefits include enhanced security, logistical support, and streamlined decision-making, crucial during disaster response. However, it is important to ensure that martial law is used appropriately and temporarily, respecting the balance between effective disaster response and the preservation of civil liberties.
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To counter insurrection
While the US Constitution does not define martial law, and it does not specify who can declare it, several presidents and state governors have imposed or approved declarations of martial law throughout US history. However, neither the Constitution nor federal law explicitly authorises the president to declare martial law. Although the Supreme Court has held that states can declare martial law, it has never specifically held that the president can. Thus, it is unclear whether the president can legally declare martial law.
Martial law refers to instances when a nation's armed forces assume the governance of an area. Officials most often impose martial law when civilian authority over an area has stopped functioning, such as in the case of an insurrection or natural disaster. Importantly, the Posse Comitatus Act forbids the US military from taking part in civilian law enforcement. However, the Insurrection Act of 1807 acts as an exception to this rule, allowing the president to deploy military forces to put down rebellions within the US and assist local law enforcement in dealing with domestic violence.
The Insurrection Act does not authorise martial law. Instead, it generally permits the military to assist civilian authorities, not take their place. Under current law, the president has no authority to declare martial law. However, the Insurrection Act has been invoked numerous times throughout US history. For example, President Abraham Lincoln invoked it at the start of the Civil War, and President Ulysses Grant used it to crush the first incarnation of the Ku Klux Klan in the 1870s.
In conclusion, while the president has no authority to declare martial law, they can deploy military forces to counter insurrection under the Insurrection Act. This Act has been invoked by several presidents throughout history to maintain order in times of crisis.
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To aid civilian law enforcement
Martial law is an extreme measure that can be taken in times of emergency or disaster, and it involves the temporary suspension of ordinary law and the imposition of direct military control over a population. When it comes to aiding civilian law enforcement, there are a few scenarios where a president may consider declaring martial law:
Civil Unrest and Riots
In situations of widespread civil unrest, riots, or violent protests, civilian law enforcement agencies may become overwhelmed and unable to maintain public order. If the situation turns deadly, involves widespread destruction of property, or poses a significant threat to national security, the president may decide to declare martial law. The military would then be called in to enforce order, protect critical infrastructure, and ensure the safety of citizens.
Natural Disasters
Natural disasters, such as hurricanes, earthquakes, or widespread wildfires, can sometimes exceed the capacity of civilian authorities to respond effectively. If a natural disaster results in widespread chaos, looting, or a breakdown of social order, the president could declare martial law to restore and maintain order. The military would be tasked with securing affected areas, preventing looting, and ensuring the safety of rescue and relief workers.
Terrorist Attacks
In the aftermath of a major terrorist attack, especially one that targets critical infrastructure or results in a high number of casualties, the president may invoke martial law to support civilian law enforcement agencies. The military would assist in securing potential targets, conducting investigations, and preventing further attacks. This ensures a swift and comprehensive response to the threat, allowing civilian authorities to focus on rescue and recovery operations.
Breakdown of Law and Order
In rare instances, a region or state may experience a complete breakdown of law and order due to various factors such as corruption, incompetence, or a lack of resources. If civilian authorities are unable to effectively enforce the law and protect the lives and property of citizens, the president could declare martial law as a temporary measure. The military would then work to restore order, ensure the public's safety, and facilitate the rebuilding of the local law enforcement infrastructure.
It is important to note that the declaration of martial law is an extraordinary action and is typically considered a last resort. It raises complex legal and constitutional issues, and as such, the president must carefully consider the potential benefits and consequences before invoking such powers.
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Frequently asked questions
The US Constitution does not define martial law and does not specify who can declare it. It is unclear whether the president can legally declare martial law, but several presidents throughout history have done so.
Martial law is usually declared in response to an insurrection, invasion, natural disaster, riot, civil unrest, or labour dispute.
When martial law is declared, local laws, civil authority, and sometimes local judiciaries are suspended. The military assumes governance of the area, and a military commander is given virtually unlimited authority to govern it.
Yes, martial law has been declared in the US about 68 times. It was last officially declared in 1963.
Yes, martial law can occur in stages without ever reaching a total military takeover.











































