
The relationship between state and federal law in the United States has been a complex and evolving issue, with the balance of power contested over time. The US Constitution, in its Supremacy Clause, resolves conflicts in favour of the federal government, declaring federal law the supreme Law of the Land. This, however, only applies when the federal government acts within its constitutionally authorised powers. The Tenth Amendment reinforces this by stating that any powers not delegated to the federal government are reserved for the states or the people. The concept of states' rights has been a contentious issue, often associated with opposition to federally mandated racial desegregation, same-sex marriage, and reproductive rights. While states cannot nullify federal laws, they are not required to enforce them, and they may voluntarily comply to receive federal grants. Ultimately, the dynamic between state and federal law is a delicate balance, with the federal government holding ultimate authority, but states retaining significant autonomy within their reserved powers.
Can state's rights be denied by federal law?
| Characteristics | Values |
|---|---|
| Supremacy | The Supremacy Clause of Article VI of the Constitution resolves conflicts between state and federal law in favor of the federal government, declaring federal law the "supreme Law of the Land" |
| Enumerated Powers | The Constitution includes exclusive federal powers, concurrent powers shared with states, and reserved powers held only by states |
| Nullification | States have attempted to nullify federal laws they deem unconstitutional, such as in the Kentucky and Virginia Resolutions and South Carolina's Nullification Ordinance |
| Civil Rights | The federal government has enforced laws on racial desegregation, same-sex marriage, and reproductive rights despite opposition from states' rights proponents |
| Social Issues | States have experimented with laws on social issues like marijuana legalization, but these can be struck down by federal law |
| State Sovereignty | The Tenth Amendment reserves powers not delegated to the federal government by the Constitution to the states or the people |
| State Powers | States traditionally hold "police powers" in areas like health, education, and welfare |
| Prohibited Powers | The Constitution outlines powers denied to states, including entering into treaties, granting letters of marque and reprisal, and passing bills of attainder |
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What You'll Learn

The Supremacy Clause
> "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 US Supreme Court has relied on the Supremacy Clause to establish a robust federal government role in managing the country's affairs. The Court has interpreted the Clause as allowing for both express and implied preemption of state law by federal law. Express preemption occurs when federal law explicitly states its supremacy over state law, while implied preemption occurs when federal law implicitly preempts state law through its structure and purpose. The Court has also developed the doctrine of field preemption, which holds that some federal legislation implicitly prevents states from adopting laws regulating the same general subject.
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McCulloch v. Maryland (1819)
The landmark case McCulloch v. Maryland (1819) is a key example of the federal government denying state's rights. The case addressed the issue of federal power and commerce, specifically the power of Congress to charter a bank, and the broader issue of the division of powers between the state and the federal government.
In 1816, Congress established the Second National Bank to control the amount of unregulated currency issued by state banks. Many states questioned the constitutionality of the national bank, and Maryland set a precedent by requiring taxes on all banks not chartered by the state. James W. McCulloch, a federal cashier at the Baltimore branch of the U.S. bank, refused to pay the taxes imposed by the state. Maryland then filed a suit against McCulloch to collect the taxes.
The Supreme Court, led by Chief Justice John Marshall, ruled that the federal government's constitutional powers were paramount over conflicting state laws. The Court decided that the chartering of a bank was an implied power of the Constitution, under the "elastic clause," which granted Congress the authority to "`make all laws which shall be necessary and proper`" for executing the functions of the federal government. This decision asserted the federal government's sovereign power over states and set a precedent for the expansion of federal power.
The McCulloch v. Maryland case demonstrated the federal government's authority to act within its constitutionally authorized powers, as outlined in the Supremacy Clause of the U.S. Constitution. This clause resolves conflicts between state and federal law in favor of the federal government, declaring federal law the "supreme Law of the Land." The case highlighted the balance of powers between the federal government and state governments, with the federal government holding ultimate authority when exercising its constitutional powers.
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Civil rights and racial segregation
The concept of "states' rights" has been historically used in opposition to federally mandated racial desegregation. The US Constitution includes exclusive federal powers, concurrent powers shared with the states, and reserved powers, or "states' rights", that only the states possess. The Constitution's Supremacy Clause gives federal law precedence over state law in cases of conflict, provided the federal government is acting within its constitutionally authorized powers.
The Civil Rights Act of 1964 superseded all state and local laws requiring segregation, marking a critical piece of American legislation that contained strong provisions against discrimination and segregation in voting, education, and the use of public facilities. Compliance with the law, however, was slow, and it took years of cases in lower courts to enforce it.
The civil rights movement was initiated by Southern Blacks in the 1950s and 1960s to break the prevailing pattern of racial segregation. This movement was confronted by proponents of racial segregation and Jim Crow laws in the Southern states, who denounced federal interference in these state-level laws as an assault on states' rights. The Jim Crow laws mandated racial segregation and enforced white supremacy, forcing the segregation of facilities and services, prohibiting intermarriage, and denying suffrage.
The roots of the civil rights movement can be traced back to the early 20th century, with the founding of the National Association for the Advancement of Colored People (NAACP) in 1909. The NAACP's goals were the abolition of segregation, discrimination, disenfranchisement, and racial violence. The organization used federal courts to challenge segregation and disenfranchisement, particularly in the South, where legal segregation in public facilities was current from the late 19th century into the 1950s.
The period between 1900 and 1939 saw a tightening of segregation and an escalation of racial oppression across the United States. Notable events during this time include the race riot in Springfield, Illinois, in 1908, and the refusal of a drugstore soda fountain counter in Detroit to serve black customers. The Great Migration, which brought thousands of black Southerners to the North, further highlighted the discrimination, segregation, and racial violence faced by African Americans.
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The Alien and Sedition Acts
The Constitution resolves any conflict between state and federal law in favour of the federal government through the Supremacy Clause of Article VI. However, this clause only applies if the federal government is acting within its constitutionally authorised powers.
The four laws that made up the Alien and Sedition Acts were:
- The Naturalization Act: This law increased the residency requirement for citizenship from 5 to 14 years.
- The Alien Friends Act: This law authorised the President to deport any non-citizen deemed "dangerous to the peace and safety of the United States" or suspected of conspiring against the government.
- The Alien Enemies Act: This law allowed for the deportation of any non-citizen hailing from a country at war with the United States.
- The Sedition Act: This law limited speech critical of the government and was used to suppress dissent.
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Marijuana legislation
From a legal perspective, the Supremacy Clause of the United States Constitution (Article VI, Clause 2) establishes that federal law takes precedence when there is a conflict between state and federal laws. This means that residents in states where marijuana is legal under state law may still be violating federal law. The federal government has the authority to enforce its marijuana laws, but it cannot compel state agents to do so, as that would be unconstitutional commandeering of a state's resources. The Tenth Amendment further limits the extent to which state laws can be federally preempted, protecting states' rights to legalize and regulate marijuana.
The practical implications of the conflict between federal and state marijuana laws have resulted in challenges for individuals and businesses operating in the state-legal marijuana industry. One significant issue relates to commerce and capital, with banks generally unwilling to do business with companies that sell marijuana due to concerns about violating federal anti-money laundering laws. This has led to many marijuana businesses operating as cash-only enterprises, making them vulnerable to theft. Additionally, federal law prohibits marijuana from crossing state lines, even between states where its sale is legal, creating market imbalances. Marijuana businesses also face challenges with federal taxes, as they are unable to take advantage of standard tax deductions and often have to pay their tax bills in cash due to limited access to banking services.
Despite the federal prohibition, the legalization of marijuana in several states has had notable impacts. It has led to a significant reduction in the number of people arrested for cannabis-related offenses and has provided safe and regulated access to cannabis for millions of Americans. The Department of Justice (DOJ) has also taken steps to address the conflict between federal and state laws. In 2013, the DOJ issued the Cole memo, clarifying their enforcement approach and identifying specific areas of federal law enforcement involvement while leaving it to states with legal cannabis to establish strict regulatory systems. In 2018, the DOJ rescinded a previous memo, requiring U.S. Attorneys to enforce laws enacted by Congress rather than following enforcement priorities. Most recently, in December 2023, President Biden issued a blanket pardon for simple possession, attempted possession, or use of marijuana in violation of federal and D.C. laws.
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Frequently asked questions
The term "state's rights" refers to the reserved powers that only the states possess, as contrasted with the exclusive federal powers and concurrent powers shared with the states.
Yes, in the event of a conflict between state and federal law, the US Constitution's Supremacy Clause gives precedence to federal law, declaring it the "supreme Law of the Land". However, this only applies when the federal government is acting within its constitutionally authorised powers.
While states cannot be forced to enact or enforce a federal regulatory program, they are not prohibited from voluntarily complying with federal law to qualify for federal grants. Recent Supreme Court rulings, such as Printz v. US, have articulated standards for these conditions to be considered a proper exercise of Congress' spending power.
In the case of McCulloch v. Maryland (1819), the Supreme Court ruled that the laws adopted by the federal government when exercising its constitutional powers take precedence over conflicting state laws. This set a precedent for federal supremacy in such cases.
During the 1950s and 1960s, proponents of racial segregation and Jim Crow laws in Southern states denounced federal interference in these state-level laws as an assault on states' rights. Another example is the Kentucky and Virginia Resolutions, secretly written by Thomas Jefferson and James Madison, which supported states' rights and called on state legislatures to nullify unconstitutional federal laws.











































