
The relationship between federal and state law in the United States is complex and has been the subject of much debate and conflict. While the Supremacy Clause gives federal law superiority over state law, states do have some options for resisting or refusing to comply with federal laws and decisions of the federal courts. This phenomenon is known as nullification, where states declare a federal law invalid or unconstitutional and refuse to enforce it. The concept of nullification was famously asserted in the Kentucky Resolutions of 1799, which stated that when a federal law is deemed unconstitutional, the appropriate remedy is for the states to nullify it. However, the Supreme Court has consistently rejected attempts by states to nullify federal laws, asserting its final authority to interpret the Constitution and federal treaties. This dynamic between federal and state authorities has significant practical and theoretical implications for the US legal system and continues to shape the country's political landscape.
| Characteristics | Values |
|---|---|
| Supremacy Clause | Allows state law to supplement or stand alongside federal law |
| State sovereignty | States can refuse to use their legislative or administrative resources to enforce federal law |
| Nullification | States can declare federal law invalid and unconstitutional |
| Interposition | States can oppose federal law in a constitutional manner |
| Federal enforcement | Federal government can enforce laws by withholding federal funds |
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What You'll Learn

Nullification
The idea of nullification first emerged in the late 18th century, with the Kentucky and Virginia Resolutions of 1798 and 1799. These resolutions asserted the states' right to interpose or nullify federal laws that were considered unconstitutional. The resolutions were a response to the Alien and Sedition Acts, which granted the president powers to deport people deemed a threat to national security and criminalized speech critical of the federal government. Vice President Thomas Jefferson believed that these acts were an overreach of federal authority and created the resolutions to nullify them.
However, it is important to note that nullification has never been legally upheld. Between 1798 and the start of the Civil War in 1861, several states attempted nullification of various federal laws, but all of these efforts were rejected by the Supreme Court. The Supreme Court affirmed that the final power to interpret the Constitution and determine the constitutionality of federal laws lies with the federal courts, not the states. The Civil War further diminished the viability of nullification, as it shifted the focus away from states' rights.
In modern times, nullification has resurfaced in various forms. For example, in 2010, Utah enacted the "State-made Firearms Protection Act," which nullified federal firearms laws within the state. Similarly, in 2011, North Dakota passed Senate Bill 2309, which declared the Patient Protection Act "null in this state." In the same year, Idaho passed House Bill 117, which declared the federal health care reform law "void and of no effect" within the state. While these laws assert states' rights and sovereignty, they exist in a legal grey area and do not always have legal backing.
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Supremacy Clause
The Supremacy Clause, part of Article VI of the US Constitution, establishes that federal law is the supreme law of the land. It was included as a response to the lack of a similar provision in the Articles of Confederation, which were in effect from 1781 to 1789. During the Confederation era, federal statutes did not bind state courts unless there was relevant state legislation.
The Supremacy Clause states:
> 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 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 inclusion of the Supremacy Clause in the Constitution was not a major source of contention during the Constitutional Convention of 1787, but it did generate controversy during debates over the Constitution's ratification. The clause was ultimately included in the Constitution, which was ratified in 1788.
In the late 18th and early 19th centuries, the Supreme Court relied on the Supremacy Clause to establish a strong role for the federal government in managing the country's affairs. The Court's early field-preemption decisions concluded that any congressional action in certain fields automatically displaced all state laws in those areas. However, the Court's stance soon gave way to broader legal and political trends, such as the demands for a more active national government during the New Deal era of the 1930s and 1940s.
While the Supremacy Clause establishes the supremacy of federal law, it is important to note that the Supreme Court has also recognised that states cannot be compelled to use state law enforcement resources to enforce federal law. This distinction is crucial in understanding the complex dynamics between federal and state powers in the United States.
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State sovereignty
The concept of state sovereignty in the United States refers to the idea that states possess a degree of autonomy and are not entirely subordinate to the federal government. While federal law supersedes state law, states do have some options to resist or reject federal laws and court decisions.
One concept that has been central to debates about state sovereignty is "nullification". This refers to the idea that a state can declare a federal law unconstitutional and refuse to enforce it. The Kentucky Resolutions of 1799 asserted the right of "nullification" of federal laws by individual states, although it did not claim that Kentucky could unilaterally refuse to enforce the Alien and Sedition Acts. The Virginia Resolutions of 1798, written by Madison, introduced the related idea of "interposition", which asserted that when the federal government exercises powers not granted by the Constitution, states have the right to oppose such actions.
In practice, states have sometimes refused to enforce federal laws or comply with federal court decisions. For example, in 2003, the Arizona Supreme Court rejected a decision of the U.S. Supreme Court, and in 2006, Michigan voters approved a ballot initiative to prevent state courts from following a ruling of the U.S. Supreme Court. States may also refuse to use their legislative or administrative resources to enforce federal laws, as the Supreme Court has affirmed that the federal government cannot "commandeer" a state's resources for this purpose.
However, states do not have the power to nullify federal laws or declare them invalid. The Supreme Court has asserted its final authority to interpret the Constitution and federal treaties, and has rejected attempts by states to nullify federal laws or treaties. For example, in Martin v. Hunter's Lessee (1816), the Supreme Court rejected the Virginia Court of Appeals' claim that its decisions on the constitutionality of federal actions were final and could not be appealed to the U.S. Supreme Court. In another case, Ableman found that the Constitution gives the Supreme Court final authority to determine the extent and limits of federal power, and that states do not have the power to nullify federal law.
The tension between state sovereignty and federal authority has been a recurring theme in American history and continues to shape the dynamic between states and the federal government today.
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Federal regulatory schemes
While states may refuse to use their legislative or administrative resources to enforce federal law, the final power to determine the constitutionality of federal laws lies with the federal courts, not the states. The Supremacy Clause is not a binary switch, and the system of federalism in the United States allows state law to supplement or stand alongside federal law.
The Regulatory Plan, published in the fall edition of the Unified Agenda of Federal Regulatory and Deregulatory Actions, outlines the regulatory priorities and significant actions that agencies plan to take in the coming year. This plan is formulated based on Executive Order 12866, "Regulatory Planning and Review," and the Office of Management and Budget's memoranda.
It is important to note that federal regulatory schemes can be amended over time, and they may also vary across countries. For instance, the regulatory scheme for cosmetic products in non-ASEAN and ASEAN Member countries includes compliance with the ASEAN Harmonized Cosmetic Regulatory Scheme and its technical documents.
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State court authority
One notable example is the case of Martin v. Hunter's Lessee, where the Virginia Court of Appeals refused to accept the US Supreme Court's decision, asserting state sovereignty and claiming that its decisions were final and not subject to appeal to the Supreme Court. The Supreme Court, however, rejected this view, asserting its authority over state courts. This case highlighted the tension between federal and state authority and the question of whether states can refuse to enforce federal laws.
In certain instances, states have indeed refused to enforce federal laws within their borders. For example, the legalisation of marijuana in some states despite federal prohibition. In these cases, the federal government must decide whether to commit resources to enforcing the federal law, recognising that state law enforcement agencies may not cooperate. This dynamic was also observed in the context of gun control and illegal immigration laws, where states created 'sanctuary' policies that contradicted federal regulations.
While states cannot be compelled to use state law enforcement resources to enforce federal law, as affirmed in the Supreme Court cases of Prigg v. Pennsylvania (1842), Printz v. United States (1997), and New York v. United States (1992), they do not have the power to nullify federal law. Nullification refers to the act of declaring a federal law unconstitutional and refusing to enforce it. While states may withhold their enforcement assistance, they cannot invalidate federal law or prevent its enforcement by the federal government.
In summary, while state court authority is limited by federal law and the interpretations of the US Supreme Court, states retain some discretion in enforcing certain federal laws, particularly when it comes to allocating resources for enforcement. The interplay between federal and state authority is complex and often subject to political and practical considerations.
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Frequently asked questions
Yes, states can refuse to enforce federal laws. This is known as "nullification". However, the federal government can still choose to enforce the law themselves.
Yes, states can reject the decisions of federal courts. This has both practical and theoretical consequences for our understanding of federal courts' influence on state law.
No, the federal government cannot force states to enforce federal laws. They can, however, incentivize states to enforce federal laws by withholding federal funds.
No, the federal government may not commandeer a state's legislative and administrative mechanisms to enforce federal law. This was affirmed by the Supreme Court in cases such as *Printz v. United States* (1997) and *New York v. United States* (1992).
No, states cannot nullify federal laws. The final power to determine the constitutionality of federal laws lies in the federal courts, not the states. The Supreme Court has asserted final authority to interpret the Constitution and federal treaties.











































