
The concept of nullification in the US Constitution refers to the power to declare federal laws unconstitutional. While the 10th Amendment outlines that powers not delegated to the federal government are reserved for the states, the federal courts have the power to determine whether federal laws are consistent with the Constitution, with the Supreme Court having final authority. This means that federal laws are superior to state laws and cannot be negated by the states, as long as they are consistent with the Constitution. The Supreme Court has held certain state laws to be unconstitutional, such as a New York law imposing a tax on every alien arriving from a foreign country, which was deemed an invalid regulation of foreign commerce. Similarly, certain acts of Congress have been deemed unconstitutional by the Supreme Court, such as the Postal Services and Federal Employees Salary Act of 1962, which was held to impose on the addressee an affirmative obligation that abridged First Amendment rights.
| Characteristics | Values |
|---|---|
| Federal laws are superior to state laws | The federal courts have the power to determine whether federal laws are consistent with the Constitution |
| Federal laws are valid and controlling | The Supreme Court has the final authority to determine whether federal laws are unconstitutional |
| Determining whether a federal law is constitutional requires interpretation of the law | The federal judicial power granted by Article III of the Constitution gives federal courts authority over cases arising under the Constitution or laws of the United States |
| Federal laws are consistent with the Constitution | The federal courts have held that federal law is controlling over state law |
| Federal laws are not consistent with the Constitution | State laws cannot negate federal laws |
| State laws are unconstitutional | When they conflict with a federal statute or treaty, through the operation of the Supremacy Clause |
| State laws are not unconstitutional | When they do not conflict with a federal statute or treaty |
| Acts of Congress are unconstitutional | When they violate the Search and Seizure Clause of the Fourth Amendment and the Self-Incrimination Clause of the Fifth Amendment |
| Acts of Congress are not unconstitutional | When they do not violate the Search and Seizure Clause of the Fourth Amendment and the Self-Incrimination Clause of the Fifth Amendment |
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What You'll Learn

Federal laws are superior to state laws
The Supremacy Clause also addresses the legal status of the laws that the Constitution empowers Congress to make, as well as the legal status of treaties and the Constitution itself. It grants Congress exclusive powers to legislate on certain matters, such as immigration, bankruptcy, and currency. For example, in Arizona v. United States, the Supreme Court held that federal immigration law preempted a state law penalizing undocumented immigrants who worked without authorization.
Additionally, the Supremacy Clause establishes the Constitution as the "supreme Law of the Land," which includes federal statutes enacted by Congress. Congress has authority over matters that cross state lines, while states have authority over matters within their own borders. Preemption can arise in any area over which Congress has authority, but it is most common in areas where Congress and the states share authority.
While federal laws are generally superior to state laws, it is important to note that Congress's power under Section 5 of the Fourteenth Amendment does not extend to defining the substance of the Amendment's restrictions. For example, in City of Boerne v. Flores, the Supreme Court held that the Religious Freedom Restoration Act was unconstitutional because it defined the substance of the Fourteenth Amendment.
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Supreme Court has final authority
The US Constitution gives the federal courts the power to determine whether federal laws are consistent with it, with the Supreme Court having the final authority. This means that federal laws are valid and controlling as long as they are adopted in pursuance of the Constitution. Interpreting the law is a judicial function, and the federal judicial power granted by Article III of the Constitution gives federal courts the authority over all cases that arise under the Constitution or the laws of the United States.
The Supreme Court first dealt with nullification in 1809 in the case of United States v. [missing case name]. During the Nullification Crisis of the 1830s, Madison denounced as unconstitutional the concept of nullification of federal law by a state. In Worcester v. Georgia, the Supreme Court rejected Georgia's attempt to nullify federal treaties with the Cherokees, holding that "according to the settled principles of our Constitution", authority over Indian affairs is "committed exclusively to the government of the Union".
The Supreme Court has held that federal laws are superior to state laws and cannot be negated by the states. The power to declare federal laws unconstitutional lies in the federal courts, not in the states. This is supported by the records of the Constitutional Convention and the state ratifying conventions, as well as the Federalist Papers. John Marshall stated in the Virginia convention that protection against infringement of the Constitution would be provided by the federal courts, and that there was "no other body that can afford such protection".
The Supreme Court has held Acts of Congress unconstitutional in whole or in part, including:
- The Postal Services and Federal Employees Salary Act of 1962, which authorised the Post Office Department to detain material determined to be "communist political propaganda", was held to impose on the addressee an affirmative obligation that abridged First Amendment rights.
- The interim provisions of the Brady Handgun Violence Prevention Act, which require state and local law enforcement officers to conduct background checks on prospective handgun purchasers, are inconsistent with the Constitution's allocation of power between the federal and state governments.
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Federal laws can be unconstitutional if inconsistent with the Constitution
Federal laws are valid and controlling as long as they are consistent with the Constitution. The federal courts, through the federal judicial power granted by Article III of the Constitution, have the authority over cases arising under the Constitution or laws of the United States. This means that federal courts have the power to determine whether federal laws are consistent with the Constitution, with the Supreme Court having the final authority.
The Supreme Court has held that federal laws are superior to state laws and cannot be negated by the states. The power to declare federal laws unconstitutional lies in the federal courts, not in the states. This was affirmed by John Marshall, who said that protection against infringement of the Constitution would be provided by the federal courts. He argued that if Congress were to make a law not warranted by any of the powers enumerated, federal judges would consider it an infringement of the Constitution, which they are to guard, and declare it void.
The Federalist Papers, specifically Federalist No. 82, indicate that the power to declare federal laws unconstitutional lies in the federal courts, not in the states. This is due to the need for uniformity and the federal government's need to effectively enforce its laws. The Supreme Court is given the power to review decisions of state courts in cases arising under the Constitution or federal law.
There have been several instances where federal laws or acts of Congress have been held to be unconstitutional in whole or in part by the Supreme Court. For example, in the case of City of Boerne v. Flores (1997), the Supreme Court held that certain provisions of the Religious Freedom Restoration Act (RFRA) were inconsistent with the Constitution's allocation of power between the federal and state governments. In United States v. Brown (1965), the Supreme Court held that a provision of the Labor-Management Reporting and Disclosure Act of 1959, which made it a crime for a member of the Communist Party to serve as an officer or employee of a labor union, was unconstitutional as it constituted a bill of attainder.
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State laws can be unconstitutional if they conflict with federal statutes
The Supremacy Clause, outlined in Article VI of the US Constitution, establishes that federal laws, the Constitution, and treaties made under its authority are the "supreme Law of the Land". This means that state laws are subordinate to federal laws and the Constitution, and that state courts are bound by federal statutes. In other words, federal laws always prevail over state laws.
State laws can be deemed unconstitutional if they conflict with federal statutes or treaties. This is not because they contravene any specific provision of the Constitution, but because they clash with federal authority. The Supreme Court has the power of judicial review, allowing it to invalidate a state statute if it violates the Supremacy Clause.
There have been numerous instances where state laws have been held to be unconstitutional due to conflict with federal law. For example, in the case of United States v. Peters (1809), a Pennsylvania statute that prohibited the execution of any process issued to enforce a federal court sentence was deemed unconstitutional as it attempted to annul the judgment of a federal court. Similarly, in the 1875 case of Loan Ass'n v. Topeka, a Kansas act authorising municipalities to issue bonds to support private enterprise was found to violate due process.
In addition to state laws, acts of Congress can also be held unconstitutional by the Supreme Court if they exceed the powers delegated to the federal government by the Constitution. For instance, in City of Boerne v. Flores (1997), the Supreme Court ruled that an act of Congress was inconsistent with the Constitution's allocation of power between federal and state governments.
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The First, Fourth, and Fifth Amendments
Federal laws can be held unconstitutional by the Supreme Court, as the highest court in the United States.
The First Amendment, ratified in 1791, states that "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech".
The Fourth Amendment, also ratified in 1791, protects people from "unreasonable searches and seizures". This amendment has been cited in cases such as Boyd v. United States (1886), where a provision authorising federal courts to require the production of documents in suits for forfeitures under revenue and custom laws was held to violate the Search and Seizure Clause.
The Fifth Amendment, again from 1791, includes protections against double jeopardy and self-incrimination, and guarantees due process. In the aforementioned Boyd v. United States case, the Self-Incrimination Clause of the Fifth Amendment was also cited as being violated by the provision.
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Frequently asked questions
Yes, federal laws can be deemed unconstitutional. The federal courts, with the Supreme Court having final authority, have been given the power to determine whether federal laws are consistent with the Constitution.
The federal judicial power granted by Article III of the Constitution gives the federal courts the authority to determine whether federal laws are consistent with the Constitution. The Supreme Court has the final authority to deem a federal law unconstitutional.
In the case of City of Boerne v. Flores, 521 U.S. 507 (1997), the Supreme Court held that Congress's power under Section 5 to "enforce" the Fourteenth Amendment does not extend to defining the substance of the Amendment's restrictions.

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