
The Supremacy Clause is a significant constitutional provision that establishes the federal government's supremacy over state law. It asserts that the Constitution, federal statutes, and treaties made under the authority of the United States are the supreme Law of the Land. This clause ensures that federal laws and treaties take precedence over any conflicting state laws, marking a departure from the Articles of Confederation, which lacked a similar provision. The Supremacy Clause also addresses concerns about states jeopardizing the nation's security by violating its treaty obligations. It empowers Congress to abrogate treaties, even if it violates international law, and allows the federal government to make treaties that supersede state law, as seen in cases like Missouri v. Holland (1920). The clause reinforces the principle of dual federalism, with the Supreme Court interpreting and applying it in ways that maintain a sharp division between federal and state powers.
| Characteristics | Values |
|---|---|
| Name of the Clause | Supremacy Clause |
| What it affirms | Treaties and federal statutes are regarded equally as "supreme law of the land" |
| Binding nature of treaties | Generally, treaties are as binding as domestic federal law |
| Treaties and state law | The Supremacy Clause allows the federal government to make treaties that supersede state law |
| Treaties and the Constitution | Treaties must be within the parameters of the Constitution |
| Treaties and Congress | Congress can abrogate a treaty by legislative action even if it violates the treaty under international law |
| Role in federalism disputes | The Supreme Court applied it in ways that reinforced dual federalism’s sharp division of federal and state power |
| Role in the Constitutional Convention | The Supremacy Clause was not a source of major disagreement at the convention |
| Ratification | The Constitution was ratified in 1788 with the Supremacy Clause |
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What You'll Learn

The Supremacy Clause
The US Supreme Court has relied on the Supremacy Clause in several cases to reinforce the priority of federal law and treaties. For example, in Martin v. Hunter's Lessee (1816) and Cohens v. Virginia (1821), the Supreme Court held that the Supremacy Clause gives it the ultimate power to review state court decisions involving federal law and the Constitution. The Court also applied the Supremacy Clause in early-twentieth-century decisions to establish the doctrine of field preemption, which states that some federal legislation implicitly prevents states from adopting laws on the same subject.
While the Supremacy Clause affirms the supremacy of federal law and treaties, it is important to note that they must still operate within the boundaries of the Constitution. The Supreme Court has the power of judicial review and can invalidate federal statutes or treaties that violate constitutional provisions. Additionally, the Court has held that treaties must comply with the Constitution and are only binding as domestic law if they are self-executing or implemented by an act of Congress.
Overall, the Supremacy Clause is a cornerstone of the US federal political structure, ensuring that federal law and treaties made under the authority of the United States take precedence over state laws, while also being subject to the limits set by the Constitution.
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Treaties as law of the land
The Supremacy Clause of the US Constitution holds that federal laws and treaties "shall be the supreme Law of the Land". This clause was included in the Constitution to address the absence of a similar provision in the Articles of Confederation, which led to federal statutes not binding state courts without state legislation during the Confederation era.
The Supremacy Clause establishes that treaties made under the authority of the United States are on par with federal statutes as the "supreme law of the land", with neither having "superior efficacy" over the other. This means that international agreements made with the advice and consent of a two-thirds supermajority of the Senate are incorporated into US law.
The Supremacy Clause also addresses the relationship between federal and state laws, specifying that federal acts take precedence over conflicting state acts. This principle, known as federal supremacy, has been consistently upheld by the Supreme Court, which has the power of judicial review to invalidate statutes that violate the Constitution. The Court has also ruled that Congress can abrogate a treaty through legislative action, even if it violates international law.
In the context of treaties, the Supremacy Clause breaks from traditional British rule, where treaties did not have domestic legal effect without implementing legislation from Parliament. In contrast, the Supremacy Clause allows treaties to directly establish rules of decision for American courts, reflecting concerns about individual states jeopardizing national security by violating treaty obligations.
The interpretation and application of the Supremacy Clause have evolved over time, with early-twentieth-century Supreme Court decisions developing the concept of field preemption, where federal legislation prevents states from adopting laws on the same general subject. While the basic principle of federal supremacy is well-settled, the Clause's role in contemporary legal doctrine differs due to the nature of preemption issues, which are primarily questions of statutory interpretation.
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Federal statutes and treaties
The Supremacy Clause, part of the US Constitution, establishes federal statutes and treaties as the "supreme law of the land". This means that federal laws and treaties take precedence over any conflicting state laws or constitutions. The Supremacy Clause was introduced as part of the New Jersey Plan during the Federal Convention of 1787 and was ratified in 1788.
The Supremacy Clause is a significant structural provision that empowers the federal government and outlines the relationship between federal and state law. It ensures that federal statutes and treaties made under the authority of the United States are binding on the judges in every state, regardless of any contrary state laws or constitutions. This was a departure from the traditional British rule, where treaties did not have domestic legal effect without implementing legislation from Parliament.
The Supreme Court plays a crucial role in interpreting and enforcing the Supremacy Clause. It has the power of judicial review, allowing it to invalidate federal statutes or treaties that violate the Constitution. The Court has used the Supremacy Clause to establish the supremacy of federal law in early cases involving conflicts between federal treaties or statutes and state laws. This principle, known as preemption, can take the form of conflict preemption, where compliance with both federal and state law is impossible, or obstacle preemption, where state law hinders federal objectives.
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Congressional treaty abrogation
The US Constitution provides that the president "shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two-thirds of the Senators present concur" (Article II, section 2). Treaties are binding agreements between nations and become part of international law. The Treaty Clause provides that the power to make treaties is shared between the President and the Senate.
While the Constitution is clear about the manner in which the Senate participates in the ratification of a treaty, it is silent on the subject of treaty termination. Throughout the 19th century, Congress passed and presidents signed joint resolutions authorizing—and sometimes even directing—the president to terminate treaties. While presidents acknowledged this congressional authority over treaty termination, they disputed congressional authority to abrogate parts of treaties, rather than modify them outright.
In Federalist 64, John Jay rejected the notion that treaties "should be repealable at pleasure," arguing that it would be impossible to find a nation "who would make any bargain with us, which should be binding on them absolutely, but on us only so long and so far as we may think proper to be bound by it." The Framers understood that republican politics could be more volatile than that of the European powers, with American presidents serving only four-year terms. Placing an uncheckable treaty termination power in new hands every four years enables a fickle foreign policy and inspires little confidence abroad.
The ability of Congress to thwart a president’s desire to terminate a treaty promotes stability in foreign policy and communicates reliability. However, the Supreme Court has also ruled that the constitutional power to make treaties is separate from the other enumerated powers of the federal government, and treaties can be used to legislate in areas otherwise within the exclusive authority of the states. This broad interpretation was circumscribed in Reid v. Covert (1957), which held that the Bill of Rights could not be abrogated by a treaty, limiting the ability of treaties to circumvent constitutional restrictions.
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Judicial review
The Supremacy Clause, part of the US Constitution, establishes the federal government's supremacy and outlines the relationship between federal and state laws. It states that:
> This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.
The Supremacy Clause was introduced as part of the New Jersey Plan during the Federal Convention of 1787, and it was ratified in 1788. This clause addresses issues with the Articles of Confederation, which lacked a provision declaring federal law's supremacy over state law. The Articles' absence of this provision resulted in federal statutes not binding state courts unless implemented through state legislation.
The Supremacy Clause establishes federal supremacy, specifying that federal acts take priority over conflicting state acts. This clause has been interpreted to mean that treaties are as binding as federal laws, with the US Supreme Court holding that treaties made under the clause are the "law of the land". This interpretation has been supported by Chief Justice John Marshall, who, in Foster v. Nielson (1829), affirmed the status of treaties as the “law of the land" while also distinguishing between self-executing and non-self-executing agreements in relation to domestic law.
The Supremacy Clause has been used by the Supreme Court to uphold the federal government's robust role in managing national affairs and to assert the supremacy of federal treaties and statutes over conflicting state laws. This has been referred to as “field preemption”, where federal legislation implicitly prevents states from adopting laws on the same general subject. However, it is important to note that federal statutes and treaties must adhere to the Constitution's enumerated powers and not violate constitutional limits on federal power, such as the Bill of Rights. In such cases, the Supreme Court can exercise judicial review and invalidate statutes that violate constitutional provisions.
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Frequently asked questions
The Supremacy Clause is a part of the US Constitution that establishes federal supremacy. It specifies that the Constitution, US federal law, and all treaties made under the authority of the United States are the "supreme Law of the Land".
The Supremacy Clause ensures that federal laws and treaties take precedence over any conflicting state laws. It gives the federal government the power to make treaties that supersede state laws, even if they might abrogate states' rights.
The Supremacy Clause binds the judges in every state to follow federal law and treaties, regardless of any contrary state laws or constitutions.
The Supremacy Clause was a response to issues with the Articles of Confederation, which lacked a provision establishing federal law as superior to state law. It was introduced as part of the New Jersey Plan during the Constitutional Convention of 1787 and was ratified in 1788.
Yes, federal statutes and treaties must be within the parameters of the Constitution and cannot violate constitutional limits on federal power, such as the Bill of Rights. The Tenth Amendment, for example, states that the federal government only has the powers delegated to it by the Constitution.











































