
The Constitution of the United States is the supreme law of the land, and no other law can conflict with it. This principle, known as federal preemption, is derived from the Supremacy Clause, which states that the Constitution, federal laws, and treaties made under the authority of the United States take priority over any conflicting state laws. The Supremacy Clause was introduced to address concerns that individual states were jeopardizing the nation's security by violating its treaty obligations. It establishes the supremacy of federal authority and ensures that the Constitution and federal laws made in pursuance thereof are followed by all states. This means that the Constitution and federal laws made under its authority predominate over civil law in cases of conflict.
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What You'll Learn

The Supremacy Clause
The core message of the Supremacy Clause is that federal laws and the Constitution take precedence over any conflicting state laws. This principle, known as federal preemption, applies regardless of whether the conflicting laws come from legislatures, courts, administrative agencies, or state constitutions. The Supremacy Clause also addresses the legal status of treaties, which are considered equally as binding as federal statutes and are subject to judicial interpretation and review.
The Supreme Court has played a significant role in interpreting and applying the Supremacy Clause, particularly in cases involving federalism disputes and the division of powers between the federal and state governments. The Court has used the Supremacy Clause to establish a robust role for the federal government in managing the nation's affairs and has concluded that federal treaties and statutes supersede inconsistent state laws.
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Federal preemption
The Supremacy Clause of the US Constitution establishes the principle of federal preemption, which holds that federal law takes precedence over state law in cases of conflict. This means that federal law displaces or supersedes state law, rendering the latter invalid in such cases. The Supremacy Clause was included in the Constitution to address concerns that individual states were compromising the nation's security by violating its treaty obligations. For instance, at the end of the Revolutionary War, several states retained debtor-relief laws that violated the Treaty of Peace between the US and Great Britain, which specified that creditors on both sides would be able to recover the full value of debts.
The Supremacy Clause explicitly states that the Constitution, federal laws made under its authority, and treaties made under the authority of the US, are the "supreme Law of the Land". This means that federal laws and treaties are regarded as "supreme law" and take priority over any conflicting state laws or constitutions. The core message of the Supremacy Clause is that the Constitution and federal laws made in pursuance thereof take precedence over any conflicting state laws. This principle is so fundamental that it is often taken for granted.
The Supreme Court has played a significant role in interpreting and applying the Supremacy Clause. While the Clause itself does not grant Congress additional powers, it addresses the legal status of the laws that the Constitution empowers Congress to make. The Supreme Court has used the Supremacy Clause to establish a robust role for the federal government in managing the nation's affairs and has concluded that federal treaties and statutes supersede inconsistent state laws. The Court has also interpreted the Clause to mean that federal law prevails over conflicting state law, even when the conflict arises from duly enacted statutes that are unconstitutional.
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Judicial review
The Supremacy Clause of the US Constitution establishes that the Constitution, federal laws made in pursuance of it, and all treaties made under the authority of the United States are the "supreme Law of the Land". This means that federal laws take priority over any conflicting rules of state law. The Supremacy Clause also addresses the legal status of the Constitution itself and the treaties and federal laws made under its authority.
The Supremacy Clause is a response to the lack of a similar provision in the Articles of Confederation, which governed the United States from 1781 to 1789. The Articles' absence of a provision declaring federal law to be superior to state law led to issues during the Confederation era, where federal statutes did not bind state courts without state legislation implementing them.
The Supremacy Clause was introduced as part of the New Jersey Plan during the Federal Convention of 1787. It was not a major source of disagreement at the convention, but it did generate controversy during debates over the Constitution's ratification. However, advocates of federal supremacy prevailed, and the Constitution was ratified in 1788 with the Supremacy Clause included.
The Supremacy Clause contains the Constitution's most explicit references to "judicial review", the idea that even duly enacted statutes do not supply rules of decision for courts if they are unconstitutional. The Supremacy Clause also establishes the supremacy of treaties over state law, which has been described as an "unquestioned axiom" of the founding of the United States. Treaties are subject to judicial interpretation and review just like federal statutes, and courts have consistently recognised them as legally binding under the Constitution.
The Supreme Court has applied the principle of federal supremacy over state law throughout the nineteenth and early twentieth centuries, although this was limited by the doctrine of dual federalism, where the federal government and states occupied distinct, non-overlapping zones of constitutional authority. The basic principle of federal supremacy is now well-settled, and preemption cases often turn on issues such as the textualist/purposivist divide and administrative deference.
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Treaties and federal statutes
The Supremacy Clause is a cornerstone of the U.S. federal political structure, introduced as part of the New Jersey Plan during the Federal Convention of 1787. It was passed unanimously and ratified in 1788. The Clause is a response to the issues with the Articles of Confederation, which lacked a provision declaring federal law superior to state law. The Supremacy Clause establishes federal preemption, which applies regardless of whether the conflicting laws come from legislatures, courts, administrative agencies, or constitutions.
The Treaty Clause of the U.S. Constitution outlines the procedure for ratifying international agreements. It empowers the President to negotiate agreements with other countries, with the advice and consent of a two-thirds supermajority of the Senate, rendering the treaty binding with the force of federal law. The Treaty Clause was influenced by the perceived flaws of the Articles of Confederation, which accorded significant autonomy to individual states.
While treaties are considered as binding as domestic federal law, there have been differing opinions on the enforceability of certain types of international agreements and the precise scope of a treaty's legal obligations. The Supreme Court has held that Congress can abrogate a treaty by legislative action, even if it violates the treaty under international law. Additionally, the enforceability of treaties was limited by the 2008 Supreme Court decision in Medellín v. Texas, which stated that a treaty is not binding domestic law unless implemented by an act of Congress or if it is explicitly "self-executing".
In conclusion, treaties and federal statutes are both considered the "supreme law of the land" under the Supremacy Clause, with treaties being incorporated into U.S. federal law through ratification. The Treaty Clause outlines the procedure for ratifying international agreements, with the President and the Senate playing key roles in the process. While treaties are generally binding, there are legal interpretations and limitations regarding their enforceability and scope.
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Federal law and state law
Federal laws apply to everyone in the United States, while state laws apply to people who live or work in a particular state. Federal laws are rules that apply across the United States, such as federal anti-discrimination and civil rights laws that protect against racial, age, gender, and disability discrimination.
The U.S. Constitution establishes a federal system of government, with power shared between the federal and state governments. The Constitution and federal laws take priority over state laws, as outlined in the Supremacy Clause. This clause specifies that federal acts take precedence over conflicting state acts. The Supremacy Clause also addresses the legal status of treaties and the Constitution itself, stating that treaties are on equal footing with federal statutes as the "supreme law of the land."
The Supremacy Clause was introduced to address issues with the Articles of Confederation, which lacked a provision declaring federal law superior to state law. The clause has been interpreted to mean that federal law prevails over conflicting state laws, with the Supreme Court applying this principle in cases throughout the 19th century. The basic principle of federal supremacy is now well-settled, with preemption applying regardless of whether the conflicting laws come from legislatures, courts, or state constitutions.
While most laws come from the federal or state governments, local agencies also have their own laws and courts. These local laws apply to specific counties, cities, or towns within a state.
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Frequently asked questions
The Supremacy Clause is a conflict-of-laws rule that specifies that federal acts take priority over state acts that conflict with federal law. The Supremacy Clause also establishes the Constitution as the "supreme law of the land", meaning that no other law can conflict with it.
Federal preemption is a constitutional principle derived from the Supremacy Clause. Preemption applies regardless of whether conflicting laws come from legislatures, courts, administrative agencies, or constitutions. For example, the Voting Rights Act of 1965, an act of Congress, preempts state constitutions.
The Supremacy Clause establishes treaties and federal statutes as equally supreme and binding under the Constitution. Treaties are also subject to judicial interpretation and review, just as any federal statute.


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