
The Supremacy Clause, found in Article VI, Clause 2 of the U.S. Constitution, establishes the Constitution and federal laws made under it as the supreme Law of the Land, taking precedence over conflicting state laws. This clause, a founding principle in U.S. constitutional law, ensures that federal laws, applying to the entire country, are supreme over state laws, which only apply within specific states. The Supremacy Clause, a response to issues with the Articles of Confederation, provides a balance between federal and state governments, preventing constant political chaos and power struggles between them.
| Characteristics | Values |
|---|---|
| Name | Supremacy Clause |
| Location | Article VI, Clause 2 of the U.S. Constitution |
| Description | A founding principle in U.S. constitutional law designating the Constitution as the "supreme law of the land" |
| Function | Ensures that federal laws and treaties take precedence over state laws and constitutions |
| Powers | Allows the federal government to make treaties superseding state law, even if they abrogate states' rights |
| Interpretation | Refers to "the Laws of the United States which shall be made in Pursuance [of the Constitution]," incorporating the idea that federal statutes must be authorised by the Constitution |
| Importance | Provides a balance between the federal government and state governments, preventing political chaos |
| History | Ratified in 1788, the Supremacy Clause addressed issues with the Articles of Confederation, which lacked a similar provision |
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What You'll Learn

The Supremacy Clause
The constitutional principle derived from the Supremacy Clause is federal preemption. Preemption applies when a federal law exists in an area where the Constitution grants authority to Congress under its enumerated powers. In such cases, the federal law prevents any conflicting state law, whether from the state's constitution, legislature, courts, or administrative agencies, from taking effect. There are two types of preemption: field preemption and conflict preemption. Field preemption occurs when federal law is so pervasive that it is reasonable to infer that Congress left no room for states to supplement it, or when the federal interest is so dominant that the federal system will be assumed. Conflict preemption occurs when compliance with both federal and state law is impossible, or when state law poses an obstacle to federal objectives.
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Federal law vs. state law
The Supremacy Clause, found in Article VI, Clause 2 of the US Constitution, establishes federal law as supreme over state law. This clause, also known as Article 6, Paragraph 2, asserts that the Constitution, federal laws, and treaties made under the authority of the United States are the "supreme Law of the Land." This means that federal laws, which apply across the entire country, take precedence over state laws, which are specific to individual states. The Supremacy Clause ensures that laws enacted by the national government outrank those made by state governments.
The inclusion of the Supremacy Clause in the Constitution was a response to the lack of a similar provision in the Articles of Confederation, which governed the United States from 1781 to 1789. During the Confederation era, federal statutes did not bind state courts unless there was state legislation implementing them. The absence of a supremacy clause in the Articles of Confederation led to concerns about political chaos and a weak federal government.
The Supremacy Clause plays a crucial role in resolving conflicts between federal and state laws. When a federal law and a state law contradict each other, the federal law prevails. This principle is known as the "doctrine of preemption." Preemption can occur in two main ways: field preemption and conflict preemption. Field preemption happens when federal law is so pervasive that it leaves no room for states to supplement it, or when the federal interest is dominant. Conflict preemption arises when compliance with both federal and state law is impossible, or when state law hinders federal objectives.
While the Supremacy Clause establishes the priority of federal law, it is important to note that federal statutes and treaties must adhere to the Constitution. They must be within the scope of the federal government's enumerated powers and must not violate constitutional limits on federal power, such as the Bill of Rights. The Tenth Amendment specifically states that the federal government only possesses the powers delegated to it by the Constitution. The Supreme Court plays a vital role in interpreting and enforcing these boundaries, exercising the power of judicial review to invalidate statutes that violate constitutional provisions.
The interpretation and application of the Supremacy Clause have evolved over time. During the New Deal era of the 1930s and 1940s, the Supreme Court expanded the areas of concurrent authority between the federal government and the states. Simultaneously, the Court narrowed the circumstances in which federal law would displace state law to protect state regulatory authority. These decisions contributed to a more complex interplay between federal and state laws, recognising the need for a balance between federal and state powers.
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The Tenth Amendment
The amendment's text reads: "The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people." This amendment was designed to ensure that the federal government's powers were limited and enumerated, preventing potential infringements on civil liberties.
The amendment also plays a role in the Supremacy Clause, which establishes the Constitution, federal laws, and treaties made under the authority of the United States as the "supreme Law of the Land." While the Supremacy Clause gives federal law priority over conflicting state laws, it must adhere to the Tenth Amendment, ensuring that federal statutes and treaties do not violate constitutional limits on federal power.
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Conflict preemption
The Supremacy Clause, found in Article VI, Clause 2 of the U.S. Constitution, establishes the Constitution, federal laws made under it, and treaties made under the authority of the United States as the "supreme Law of the Land". This means that federal laws take precedence over state laws in the event of a conflict. This clause is a founding principle in U.S. constitutional law and plays a crucial role in maintaining a strong federal government by preventing constant political chaos and power struggles between the states and the federal government.
The Supreme Court has played a significant role in interpreting and applying the Supremacy Clause. In cases such as Gibbons v. Ogden, the Supreme Court affirmed that Congress alone has the power to regulate interstate commerce. This power has been used to prohibit racial discrimination in restaurants serving interstate travellers or food that has moved in interstate commerce. The Court has also recognised various ways in which federal statutes can "preempt" or displace state law, ensuring that federal laws do not smother state regulatory authority.
While the Supremacy Clause establishes the primacy of federal law, it is important to note that federal statutes and treaties must still operate within the boundaries of the Constitution. They must be pursuant to the federal government's enumerated powers and not violate constitutional limits on federal power, such as the Bill of Rights. The Tenth Amendment specifically states that the federal government only possesses the powers delegated to it by the Constitution. Therefore, the Supremacy Clause ensures a balance between federal and state powers, providing unity and finality in areas of conflict between federal and state laws.
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Judicial review
The Supremacy Clause, found in Article VI, Clause 2 of the US Constitution, establishes the Constitution, federal laws, and treaties made under the authority of the United States as the "supreme Law of the Land". This clause, also known as Article 6, Paragraph 2, asserts the supremacy of federal law over state law, ensuring that laws enacted by the national government take precedence over those made by state governments. The Supremacy Clause serves as a crucial pillar in the American political structure, providing stability and preventing constant power struggles between states and the federal government.
The inclusion of the Supremacy Clause in the Constitution was a response to the deficiencies of the Articles of Confederation, which lacked a similar provision. During the Confederation era, federal statutes did not bind state courts without state legislation implementing them, leading to challenges in managing the nation's affairs. The Supremacy Clause addressed this issue, and its inclusion in the Constitution was ratified in 1788.
The Supremacy Clause is closely tied to the concept of judicial review, which refers to the power of the judiciary to examine the compatibility of a statute with the Constitution and invalidate any statute that violates constitutional provisions. This power is vested in the United States Supreme Court, which has the final authority to interpret the Constitution and ensure that federal laws and treaties do not exceed the boundaries set by the Constitution.
The Supreme Court's interpretation and application of the Supremacy Clause have evolved over time. Initially, the Court relied on the Clause to establish a robust role for the federal government in the late eighteenth and early nineteenth centuries. During the New Deal era of the 1930s and 1940s, the Court expanded the areas of concurrent authority between the federal government and the states. However, it also narrowed the circumstances in which federal law displaced state law to protect state regulatory authority.
In modern times, the Supreme Court has recognised various ways in which federal statutes can preempt or take precedence over state law. This includes field preemption, where federal law is so pervasive that it leaves no room for state supplementation, and conflict preemption, where compliance with both federal and state law is impossible. The Court has also held that the Supremacy Clause allows the federal government to make treaties that supersede state law, even if they abrogate states' rights under the Tenth Amendment.
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Frequently asked questions
Article VI, Clause 2 of the U.S. Constitution, also known as the Supremacy Clause.
The Supremacy Clause is a founding principle in U.S. constitutional law that designates the Constitution as the "supreme law of the land". This means that when state laws conflict with the Constitution, the Constitution wins.
The Supremacy Clause states that the Constitution, federal laws made pursuant to it, and treaties made under the authority of the United States, constitute the "supreme Law of the Land", and thus take priority over any conflicting state laws.
The Supremacy Clause helps provide a balance between the federal government and state governments. It ensures that the laws enacted by the national government outrank or take precedence over laws enacted by state governments.









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