
The relationship between federal and state law in the United States is complex and often a source of confusion. While the Supremacy Clause establishes that federal law takes precedence over state law, there are instances where states have rejected or refused to enforce federal regulations. This dynamic between federal and state law has significant practical and theoretical implications for federal courts' influence on state law. This is particularly evident in cases where states have legalised marijuana or created sanctuary cities, despite federal laws prohibiting these actions. Understanding the interplay between federal and state law is crucial for maintaining a balanced and effective legal system in the United States.
Can States Overturn Federal Law?
| Characteristics | Values |
|---|---|
| Power to declare federal laws unconstitutional | Lies in the federal courts, not in the states |
| Supremacy Clause | Federal statutes and treaties override state constitutions and bills of rights |
| State sovereignty | The Tenth Amendment establishes a system of dual sovereignty |
| State rejection of federal law | States can reduce the practical impact of federal court decisions |
| Nullification | States do not have the power to nullify federal law |
| Interposition | States cannot use interposition to protect laws that conflict with federal law |
| Federal funding | The federal government can threaten to withhold federal funds to keep states in line |
| Federal enforcement | The federal government may not have sufficient resources to enforce its laws |
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What You'll Learn

The Supremacy Clause
The Supreme Court has relied on the Supremacy Clause to reinforce the division between federal and state powers. The Court has interpreted the clause to mean that federal law can preempt state law either expressly or impliedly. Express preemption occurs when federal law explicitly states its supremacy over state law, while implied preemption happens when the intent to preempt state law is implicit in 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.
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State sovereignty
The Supremacy Clause of the United States Constitution establishes that federal law takes precedence over state law in cases of conflict. This means that federal law is supreme and cannot be overturned by individual states. However, this does not mean that states have no say in the matter. States can challenge federal laws and assert their sovereignty in several ways.
One way for states to challenge federal laws is through the theory of nullification. Nullification is the idea that a state has the right to declare a federal law unconstitutional and refuse to enforce it within its borders. The earliest assertion of nullification can be found in the Kentucky and Virginia Resolutions of 1798, written by Thomas Jefferson and James Madison, which protested against the Alien and Sedition Acts. These resolutions argued that the states had the right to interpret the Constitution and could declare federal laws unconstitutional if the federal government exceeded its delegated powers.
However, the Supreme Court has explicitly rejected nullification in cases such as Cooper v. Aaron (1958), where the state of Arkansas attempted to prevent the integration of its schools, and in United States v. (1809), where Georgia tried to nullify federal treaties with the Cherokees. The Court asserted its final authority to interpret the Constitution and federal treaties, rejecting state nullification attempts.
While states cannot directly overturn federal laws, they can influence and shape their implementation. States can pass laws or take actions that supplement or stand alongside federal law, as seen in the examples from Arizona and Michigan. Additionally, states have inherent "police power," which allows them to regulate certain areas, such as foreign imports and exports, conduct foreign affairs, and burden interstate commerce, as long as they respect the decisions of other states' courts.
In conclusion, while states cannot outright overturn federal laws, they possess a degree of sovereignty that allows them to challenge, reject, and influence the implementation of those laws. The dynamic between state sovereignty and federal law is complex and constantly evolving, with the Supreme Court playing a crucial role in interpreting and defining the boundaries of their relationship.
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Federal court decisions
The Supremacy Clause establishes that federal law takes precedence over state law. This means that federal statutes enacted by Congress are the "supreme Law of the Land". However, this does not mean that states must base their laws on federal statutes. For example, while Congress has established federal income taxes, states are not required to structure their tax systems in the same way.
The Federalist Papers indicate that the power to declare federal laws unconstitutional lies with the federal courts, not the states. This power was asserted by Luther Martin, who wrote that the states would be bound by federal court decisions. John Marshall also stated that protection against infringement of the Constitution would be provided by the federal courts.
In the Kentucky and Virginia Resolutions of 1798, Thomas Jefferson and James Madison argued that "the states" have the right to interpret the Constitution and can declare federal laws unconstitutional when the federal government exceeds its powers. These resolutions are considered the foundational documents of the theories of nullification and interposition. However, during the Nullification Crisis of the 1830s, Madison denounced as unconstitutional the concept of nullification of federal law by a state.
The Supreme Court explicitly rejected nullification in the case of Cooper v. Aaron (1958). The state of Arkansas had passed laws to prevent the integration of its schools, but the Supreme Court held that state governments could not nullify federal law. The Supreme Court has also rejected interposition in a similar context, affirming the decision of a federal district court that rejected Louisiana's attempt to use interposition to protect its segregated schools.
In some cases, states have rejected the decisions of federal courts. For example, in 2003, the Arizona Supreme Court agreed to "reject" a decision of the U.S. Supreme Court, and in 2006, Michigan voters approved a ballot initiative to "freeze" state law to prevent state courts from following a ruling of the U.S. Supreme Court. While these cases may seem surprising, they are not considered unlawful as the Supremacy Clause is not a binary switch, and state law can stand alongside federal law.
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Nullification and interposition
The ideas of nullification and interposition first emerged in the Kentucky and Virginia Resolutions of 1798, written by Thomas Jefferson and James Madison, respectively. These resolutions asserted that the states had the right to interpret the Constitution and to declare federal laws unconstitutional when the federal government exceeded its delegated powers. The Kentucky Resolutions of 1798, written by Jefferson, stated that the states formed the Constitution as a compact, delegating certain powers to the federal government while reserving all other powers for themselves. Madison's Virginia Resolution took a slightly different approach, focusing on the duty of states to "interpose" and prevent harm from unconstitutional actions by the federal government.
During the Nullification Crisis of the 1830s, Madison clarified his position, arguing that nullification of federal law by a single state was inconsistent with the Constitution and would lead to anarchy. The Supreme Court also dealt with nullification during this time, rejecting Georgia's attempt to nullify federal treaties with the Cherokees. The Court asserted its final authority to interpret the Constitution and federal treaties, stating that Georgia's laws regulating Cherokee land were "void" and "repugnant to the Constitution, treaties, and laws of the United States".
While nullification and interposition have been invoked by states throughout US history, the Supreme Court has explicitly rejected these doctrines. In Cooper v. Aaron (1958), the Court held that state governments could not nullify its decisions or implement "evasive schemes" to circumvent them. The Court also rejected interposition, affirming a federal district court decision that struck down Louisiana's attempt to use interposition to protect its segregated schools. These rulings affirmed the primacy of federal law over state attempts to nullify or interpose.
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Sanctuary states
The concept of "sanctuary states" refers to jurisdictions that have laws or policies that limit cooperation with federal immigration authorities. While sanctuary states are not compelled by federal law to participate in immigration enforcement, they are prohibited from actively obstructing the enforcement of federal law. Sanctuary jurisdictions include cities, counties, and states that have laws, ordinances, or practices that shield immigrants from federal immigration enforcement actions. These practices can include refusing to comply with ICE detainers, imposing conditions on detainer acceptance, or impeding communication between local personnel and federal immigration officers.
As of 2024, there are 11 sanctuary states in the United States, including California, Colorado, Connecticut, Illinois, Massachusetts, New Jersey, Oregon, Rhode Island, Utah, Vermont, and Washington. These states have taken various approaches to becoming sanctuary states, such as through executive action or the passage of specific laws. For example, California became a sanctuary state after Governor Jerry Brown signed the California Values Act in 2017, while Illinois became a sanctuary state in 2017 through the Illinois Trust Act.
The establishment of sanctuary states has been a controversial issue, with some arguing that these policies place the public at risk by hindering the ability of federal authorities to locate, arrest, and deport criminal aliens. There are also concerns that sanctuary policies may violate the Supremacy Clause of the United States Constitution and the 10th Amendment. On the other hand, supporters of sanctuary policies argue that they protect immigrant communities from biased policing, imprisonment, and deportation practices.
It is important to note that states do not have the authority to nullify federal law. The power to declare federal laws unconstitutional lies with the federal courts, as indicated by the Federalist Papers and affirmed by the Supreme Court in cases such as Cooper v. Aaron. However, states may attempt to reject or supplement federal law through various means, and the Supremacy Clause allows for state law to stand alongside federal law in certain circumstances.
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Frequently asked questions
No, states cannot overturn federal law. The Supremacy Clause gives Congress the authority to override aspects of each state's constitution and bill of rights. The Supreme Court has also explicitly rejected nullification, affirming that state governments cannot nullify federal laws.
The Supremacy Clause establishes the "supreme Law of the Land", which includes federal statutes enacted by Congress. It gives Congress the power to put certain topics off-limits to state law or restrict what state law can say about those topics.
While states cannot overturn federal law, they can choose not to follow it or reject the decisions of federal courts. For example, states have legalized marijuana and created gun and illegal immigrant "sanctuary" states despite federal law. However, the federal government can threaten to withhold federal funds to pressure states to comply with federal law.

















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