
The concept of contradictory laws and their constitutionality is a complex topic that often arises in legal discussions. When two laws appear to contradict each other, the initial approach is to seek a harmonious interpretation of both. However, if reconciliation proves impossible, certain principles come into play to determine which law takes precedence. This scenario can occur between federal and state laws, state constitutions, or even within the same federal or state laws. The resolution often depends on the specificity and recency of the laws in question. In the context of the United States, the Supremacy Clause plays a crucial role in determining the outcome of conflicting laws, with federal laws typically taking precedence over state laws and constitutions.
| Characteristics | Values |
|---|---|
| Federal law | Supreme over state laws and constitutions |
| Contradiction between two laws | Interpret the two laws harmoniously |
| Specific law trumps general law | |
| More recent law takes precedence | |
| Interpretation that makes the most sense in the context of the rest of the law | |
| Interpretation that does not conflict | |
| State laws | Held to be preempted by federal law due to conflict with a federal statute or treaty |
| Inconsistency between the Statutes at Large and the U.S. Code | Effect shall be given for all purposes to the Statutes at Large |
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What You'll Learn

Federal law takes precedence over state law
Laws can be contradictory but still constitutional, and this is often resolved by the more recent law taking precedence. This is also the case when it comes to federal law and state law. The Supremacy Clause of the US Constitution establishes that the Constitution, federal laws made pursuant to it, and treaties made under its authority, constitute the "supreme Law of the Land", and thus take priority over any conflicting state laws.
The Supremacy Clause, found in Article VI, Section 2 of the US Constitution, outlines that federal law supersedes state laws. Alexander Hamilton, in Federalist No. 33, writes about the Supremacy Clause, stating that federal laws, by definition, must be supreme. If they are not, they amount to nothing. James Madison, in Federalist No. 44, defends the Supremacy Clause as vital to the functioning of the nation.
The Supremacy Clause specifies that certain federal acts take priority over any state acts that conflict with federal law. This includes areas such as immigration, bankruptcy, and currency, where states do not have the authority to create their own systems. It also applies to areas where Congress and the states share authority, such as the "power to lay and collect taxes".
The Supreme Court plays a key role in interpreting and enforcing the Supremacy Clause. It tries to follow lawmakers' intent and prefers interpretations that avoid preempting state laws. However, when a conflict arises between federal and state laws, the Supreme Court can rule that federal law preempts state law. For example, in Arizona v. United States, the Supreme Court held that federal immigration law preempted a state law penalizing undocumented immigrants working without authorization.
In conclusion, federal law takes precedence over state law due to the Supremacy Clause of the US Constitution. This clause establishes the supremacy of federal law and is supported by legal scholars and enforced by the Supreme Court.
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Interpreting laws harmoniously
The Doctrine of Harmonious Construction is a tool that helps judges and legal experts make sense of conflicting laws or rules. It is a rule of interpretation that ensures laws are understood and applied smoothly without nullifying the legislation. The doctrine encourages the judiciary to interpret laws in a manner that avoids clashes and contradictions. This is done by giving equal importance to both conflicting provisions to minimise their inconsistency, reading the provisions in their entirety, and considering the provision with a broader scope or applicability.
The doctrine of harmonious construction is based on the principle that every statute has a legal purpose and should be read in its totality. The interpretation should be consistent with all the provisions of the statute. This doctrine is followed when there is an inconsistency between two or more statutes or sections of a particular statute. The doctrine aims to give effect to all the provisions while maintaining the overall coherence and purpose of the law.
The doctrine of harmonious construction is a way to interpret laws that may be in conflict with each other. It is a rule of interpretation that gives effect to all the provisions of a law while maintaining its overall coherence and purpose. The doctrine is based on the idea that every law has a purpose and should be interpreted in a way that is consistent with all its parts. This doctrine is used by courts to interpret laws in a way that removes inconsistencies and allows all provisions to remain in force, working together harmoniously.
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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 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 contains explicit language stating its supremacy over state law. Implied preemption happens when the intent for federal law to supersede state law is implicit in its structure and purpose. The Court has also recognised the concept of field preemption, where federal law is so pervasive that it leaves no room for state supplementation, or the federal interest is so dominant that it precludes state laws on the same subject.
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State laws deemed unconstitutional
When two laws contradict each other, the first step is to try to find a way to interpret them harmoniously. If that fails, a more specific law will take precedence over a more general one. For example, a law about property in general will be trumped by a more specific law relating to snowmobiles. If the contradiction is within the same law, the court will likely interpret it in a way that makes the most sense in the context of the rest of the law. Ultimately, if two laws truly contradict each other, the more recent law will take precedence as it is held to have implicitly repealed the older law.
In the United States, state laws can be deemed unconstitutional by the Supreme Court. This can occur when state laws conflict with federal law or the U.S. Constitution. For example, in Chalker v. Birmingham & N. W. Ry. (1919), a Tennessee act that imposed an annual tax on railway construction work was found to violate the Privilege and Immunities Clause of Art. IV, § 2. In another case, New York v. United States (1992), the Supreme Court held that a portion of the Balanced Budget and Emergency Deficit Control Act that authorised the Comptroller General to determine spending reductions and report to the President violated the constitutional separation of powers.
State laws can also be deemed unconstitutional when they conflict with federal statutes or treaties through the operation of the Supremacy Clause. For instance, in Frontiero v. Richardson (1973), federal statutes that differentiated between spouses of female and male members of the Armed Forces in terms of dependency for certain benefits were held to be an invalid sex classification under the equal protection principles of the Fifth Amendment's Due Process Clause.
It is important to note that when two federal laws contradict each other, the more recent law takes precedence, and in the case of a conflict between federal courts and state courts or constitutions, federal court rulings are supreme.
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The more recent law takes precedence
When two laws contradict each other, the first step is to try to find a way to interpret them harmoniously. If that fails, a more specific law will override a more general one. For example, a law about property in general will not apply where there is a more specific law relating to snowmobiles. If the laws still cannot be reconciled, then the more recent law takes precedence, as it is held to have implicitly repealed the older law to the extent of the contradiction.
This principle is illustrated in the case of Duluth & I. R. R. v. St. Louis County (1900). A Minnesota statute repealed all former tax exemption laws and provided for the taxation of lands granted to railroads. This impaired the obligation of contracts. The more recent law took precedence, and the older law was implicitly repealed.
The idea that the more recent law takes precedence also applies when two federal laws, or two laws from the same state, contradict each other. In such cases, the more recent law will be the one that is obeyed.
In some cases, a court may be able to interpret statutes so that they do not conflict. However, if there is a contradiction, the more recent law will take precedence, even if this means that the older law is implicitly repealed.
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Frequently asked questions
In the case of two federal laws or two laws from the same state contradicting each other, the more recent law is generally considered to be correct. If the contradiction is between a federal court and a state court or state constitution, the federal court is considered supreme.
State or local laws can be considered invalid if they conflict with a federal statute or treaty, but this does not necessarily mean they are unconstitutional.
A Minnesota statute that repealed all former tax exemption laws and imposed taxes on lands granted to railroads impaired the obligation of contracts and was held unconstitutional.


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