
The relationship between federal and state law in the United States is complex and often a source of confusion. While Congress frequently amends federal laws, it cannot directly modify state laws. This dynamic is known as the anti-commandeering doctrine, which prevents Congress from compelling states to enact specific laws. However, federal laws take precedence over state laws, and states cannot repeal federal laws. States may choose not to follow certain federal laws, particularly when the federal government lacks the law enforcement resources to enforce them uniformly, as seen with marijuana legalization in some states. Nonetheless, the federal government can exert influence by threatening to withhold federal funds or imposing conditions on federal funding, prompting states to modify their laws.
| Characteristics | Values |
|---|---|
| Can states repeal federal law? | No |
| Can federal courts overturn state court decisions on matters of state law? | Yes |
| Can Congress rewrite state law? | No |
| Can Congress directly modify state law? | No |
| Can Congress enact a law that compels states to enact a certain law? | No |
| Can the federal government withhold funds from states? | Yes |
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What You'll Learn

Federal preemption
While Congress can amend federal laws, it cannot directly modify or rewrite state laws. It can, however, pass laws that inspire or compel states to enact certain laws. For example, Congress might pass a law that puts stronger conditions on federal funding, which could influence states to modify their laws. This is a form of indirect influence rather than a direct modification.
There are also constitutional limitations on the power of Congress to directly regulate the operations of state governments, known as the anti-commandeering doctrine. This doctrine asserts that Congress cannot compel states to enact or enforce a federal law. For instance, in New York v. United States (1992), the U.S. Supreme Court held that the Low-Level Radioactive Waste Policy Amendments Act of 1985 was unconstitutional because it required states to provide for the disposal of waste generated within their borders.
Despite these limitations, there are instances where state laws have been held unconstitutional due to conflicts with federal laws or the U.S. Constitution. For example, in Fletcher v. Peck (1810), a Georgia statute that annulled conveyance of public lands was found to violate the Contracts Clause of the Constitution. Similarly, a Kansas law imposing certain requirements on foreign corporations engaged in interstate commerce was deemed unconstitutional as it imposed an invalid burden on interstate commerce.
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State power
In the United States, state power is limited by the Constitution and federal law. While states have the power to create and enforce their own laws, they cannot override or repeal federal law. This is because the US Constitution establishes a federal system of government, which means that the national government has supremacy over state governments.
However, this does not mean that states have no power to challenge or influence federal law. States have the power to pass laws that conflict with federal law, as long as they do not directly annul or violate federal law. For example, several states have legalised marijuana, created gun sanctuaries, and established sanctuary states for illegal immigrants, despite federal prohibitions. In these cases, the federal government has limited law enforcement resources and relies on cooperation from state and local law enforcement to enforce federal law.
Additionally, states have the power to challenge federal laws in court if they believe those laws are unconstitutional. The US Supreme Court has limited the authority of Congress to directly regulate the operations of state governments, a doctrine known as anti-commandeering. For example, in New York v. United States (1992), the Supreme Court held that the Low-Level Radioactive Waste Policy Amendments Act of 1985 was unconstitutional because it compelled states to enact legislation directed by the federal government.
Furthermore, Congress can pass laws that indirectly influence states to modify their laws. For instance, by putting stronger conditions on federal funding, Congress can incentivise states to change their laws in areas such as college funding or highway operations.
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Supremacy Clause
The Supremacy Clause is one of the most significant structural provisions of the US Constitution. It establishes that the Constitution, federal laws made under its authority, and all treaties made under US authority are the supreme law of the land. This means that federal law is superior to state law, and state judges are bound by it.
The Supremacy Clause was included in the Constitution in 1788, in response to problems with the Articles of Confederation, which lacked a similar provision. During the Confederation era, federal statutes did not bind state courts unless there was state legislation implementing them. The Supremacy Clause aimed to address this issue by reinforcing the division of federal and state power, with the Supreme Court applying it in ways that maintained this dual federalism.
The Supreme Court has interpreted the Supremacy Clause to mean that federal law can preempt state law, either expressly or impliedly. Express preemption occurs when federal law explicitly states that it is preempting state law, while implied preemption occurs when that intent is inferred from the structure and purpose of the federal law.
The Court has also developed the doctrine of field preemption, which holds that some federal legislation implicitly prevents states from adopting laws on the same subject. This means that any congressional action in certain fields automatically displaces all state laws in those areas. However, Congress itself cannot directly rewrite state laws; it can only modify its own acts, which may then prompt states to modify their own laws.
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Anti-commandeering doctrine
The anti-commandeering doctrine is a judicially created federalism protection that limits the authority of Congress to directly regulate the operations of state governments. It is derived from the Tenth Amendment and related federalism principles, despite having weak support in precedent and no basis in the text or history of the Constitution. The doctrine was established in two cases: New York v. United States (1992) and Printz v. United States (1997).
The anti-commandeering doctrine states that the federal government cannot require states or state officials to adopt or enforce federal law. This includes prohibiting states from enacting certain laws. The doctrine aims to protect liberty by ensuring a "healthy balance of power" between the states and the federal government, promoting political accountability, and preventing Congress from shifting the costs of regulation to the states.
In the case of New York v. United States, the Supreme Court held that the Low-Level Radioactive Waste Policy Amendments Act of 1985 unconstitutionally directed states to enact legislation as it imposed upon them the obligation to provide for the disposal of waste generated within their borders. Similarly, in Printz v. United States, the Court ruled that Congress lacks "the power to issue orders directly to the States".
The anti-commandeering doctrine has been the subject of debate, with some arguing for its abandonment due to its perceived unworkability and lack of basis in constitutional law. However, key federalism rulings suggest that the Supreme Court is unlikely to abandon this doctrine anytime soon.
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Sanctuary states
While states cannot directly repeal federal law, they can refuse to cooperate with federal authorities in certain instances. This is the case with "sanctuary states", which are states that have passed laws restricting cooperation with federal immigration authorities. There are currently 11 sanctuary states in the US, including California, Illinois, Massachusetts, and New Jersey. Sanctuary states are jurisdictions that refuse to cooperate with federal immigration enforcement activities, although federal law prohibits them from actively obstructing the enforcement of federal law.
Sanctuary policies are often enacted to protect immigrant residents from biased policing, imprisonment, and deportation. However, some argue that these policies place the public at risk by preventing federal authorities from locating, arresting, and prosecuting criminal aliens. The Trump administration attempted to withhold federal funding from sanctuary cities, but this was deemed unconstitutional by a federal judge.
The anti-commandeering doctrine limits the authority of Congress to directly regulate the operations of state governments. This means that while Congress can pass laws that may inspire states to modify their laws, it cannot directly compel states to enact or modify legislation. This was demonstrated in the case of New York v. United States, where the Supreme Court held that the Low-Level Radioactive Waste Policy Amendments Act of 1985 unconstitutionally forced states to enact legislation.
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Frequently asked questions
No, states cannot repeal federal law. However, they can choose not to follow it.
Yes, states can choose not to follow federal law, but the federal government can threaten to withhold federal funds to keep states in line.
No, the federal government cannot modify state law. However, it can pass laws that inspire states to modify their own laws.
Yes, federal courts can overturn state court decisions on matters of state law.
No, Congress cannot enact a law that compels states to enact a certain law. This is called the anti-commandeering doctrine.



























