
The Commerce Clause, or Article 1, Section 8, Clause 3 of the U.S. Constitution, grants Congress the power to regulate commerce with foreign nations, among states, and with Indian tribes. While the Commerce Clause has been interpreted broadly throughout U.S. history, it does not explicitly define the term commerce, leading to debates over the extent of congressional power. The Dormant Commerce Clause, an interpretation of the original clause, prohibits states from passing laws that discriminate against or excessively burden interstate commerce. This has been a significant and ongoing controversy regarding the balance of power between federal and state governments.
| Characteristics | Values |
|---|---|
| Can states adopt laws that discriminate intrastate commerce? | Yes, but only in relation to intoxicating liquors of domestic origin. |
| Basis for state laws | The Twenty-First Amendment, which restored to states the powers they had before Prohibition to regulate liquor. |
| Limitations on state laws | The nondiscrimination principle of the Commerce Clause. |
| Exceptions | Discrimination in favor of local products can be upheld if the state "advances a legitimate local purpose that cannot be adequately served by reasonable nondiscriminatory alternatives." |
| Examples of discriminatory state laws struck down by the Court | Michigan and New York laws allowing in-state but not out-of-state wineries to make direct sales to consumers. |
| Examples of nondiscriminatory state laws upheld by the Court | State laws mandating a three-tier distribution scheme for liquor. |
| Interpretation of "commerce" | The Supreme Court held that commerce includes "a business such as insurance." |
| Powers of Congress over intrastate commerce | The power of Congress over intrastate commerce extends to activities that "so affect interstate commerce or the exercise of the power of Congress over it as to make regulation of them appropriate." |
| Role of the Dormant Commerce Clause | Prohibits states from passing legislation that discriminates against or excessively burdens interstate commerce. |
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What You'll Learn

The Commerce Clause and its interpretation by the Supreme Court
The Commerce Clause, or Article 1, Section 8, Clause 3 of the U.S. Constitution, gives Congress the power "to regulate commerce with foreign nations, among the states, and with the Indian tribes". The interpretation of the Commerce Clause has been a source of significant and ongoing controversy regarding the balance of power between the federal government and the states. This is because the Constitution does not explicitly define "commerce", leading to differing interpretations of the powers it grants Congress.
The Supreme Court has generally taken a broad interpretation of the Commerce Clause throughout US history. In Gibbons v. Ogden (1824), the Supreme Court held that intrastate activity could be regulated under the Commerce Clause, provided that the activity is part of a larger interstate commercial scheme. In Swift and Company v. United States (1905), the Court ruled that Congress had the authority to regulate local commerce as long as it could become part of a continuous "current" of commerce involving the interstate movement of goods and services.
However, between 1905 and 1937, during what became known as the Lochner era, the Supreme Court narrowed its interpretation of the Commerce Clause. During this period, the Court experimented with the idea that the Commerce Clause does not empower Congress to pass laws that impede an individual's right to enter a business contract. Beginning with NLRB v. Jones & Laughlin Steel Corp in 1937, the Court returned to a broader interpretation of the clause, holding that an activity was commerce if it had a "substantial economic effect" on interstate commerce.
In United States v. Lopez (1995), the Supreme Court attempted to curtail Congress's broad legislative mandate under the Commerce Clause by adopting a more conservative interpretation of the clause. The Court rejected the government's argument that the federal government could regulate firearms in local schools under the Commerce Clause, holding that Congress only has the power to regulate the channels of commerce, the instrumentalities of commerce, and action that substantially affects interstate commerce.
In Gonzales v. Raich, the Court returned to a more liberal construction of the Commerce Clause in relation to intrastate production, upholding federal regulation of intrastate marijuana production. In NFIB v. Sebelius (2012), the Court held that the individual mandate in the Affordable Care Act, which required uninsured individuals to secure health insurance or pay a penalty, could not be enacted under the Commerce Clause as it was not the regulation of commercial activity.
The Commerce Clause also indirectly affects state governments through what is known as the Dormant Commerce Clause, which refers to the prohibition against states passing legislation that discriminates against or excessively burdens interstate commerce. For example, in West Lynn Creamery Inc. v. Healy, the Supreme Court struck down a Massachusetts state tax on milk products because it impeded interstate commercial activity by discriminating against non-Massachusetts citizens and businesses.
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State laws discriminating against imported intoxicating liquors
The Twenty-First Amendment, which repealed the Eighteenth Amendment and ended Prohibition in 1933, leaves the regulation of alcohol to state governments. The Twenty-First Amendment prohibits the "transportation or importation" of alcohol "into any State, Territory, or Possession of the United States" "in violation of the laws thereof", thus allowing state and local control of alcohol.
In a series of decisions rendered shortly after the ratification of the Twenty-First Amendment, the Court established that states could adopt legislation discriminating against imported intoxicating liquors in favor of those of domestic origin. This interpretation stemmed from the Court's conclusion that the Twenty-First Amendment restored to states the powers they had possessed before Prohibition, allowing them to regulate the transportation, importation, and use of liquor.
However, modern cases have recognized that "state regulation of alcohol is limited by the nondiscrimination principle of the Commerce Clause." The Commerce Clause refers to Article 1, Section 8, Clause 3 of the U.S. Constitution, which gives Congress the power "to regulate commerce with foreign nations, among the states, and with the Indian tribes." The Dormant Commerce Clause, implicit in the Commerce Clause, prohibits states from passing legislation that discriminates against or excessively burdens interstate commerce.
For example, in Granholm v. Heald, the Court invalidated Michigan and New York laws that allowed in-state but not out-of-state wineries to make direct sales to consumers. The Court held that these laws "involved straightforward attempts to discriminate in favor of local producers . . . contrary to the Commerce Clause," and that they could not be "saved by the Twenty-first Amendment." Similarly, in Tennessee Wine & Spirits Retailers Ass’n. v. Thomas, the Court rejected the argument that a law should be deemed constitutional under the Twenty-First Amendment simply because it or a similar law existed before Prohibition.
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State laws that impede interstate commercial activity
The Commerce Clause, or Article 1, Section 8, Clause 3 of the U.S. Constitution, gives Congress the power to "regulate commerce with foreign nations, among states, and with the Indian tribes". The interpretation of the Commerce Clause has varied over time, with courts generally taking a broad interpretation for much of U.S. history. However, there was a brief period between 1905 and 1937, known as the Lochner era, where the Supreme Court narrowed its interpretation. During this time, courts debated the idea that the Commerce Clause does not empower Congress to pass laws impeding an individual's right to enter a business contract.
The Commerce Clause affects state governments through what is known as the Dormant Commerce Clause, which prohibits states from passing legislation that discriminates against or excessively burdens interstate commerce. This includes preventing protectionist state policies that favour state citizens or businesses over non-citizens conducting business within the state. For example, in West Lynn Creamery Inc. v. Healy, the Supreme Court struck down a Massachusetts state tax on milk products as it impeded interstate commercial activity by discriminating against non-Massachusetts citizens and businesses.
While the Commerce Clause has been interpreted broadly, it is not without limits. In United States v. Lopez (1995), the Supreme Court attempted to curtail Congress's broad legislative mandate by returning to a more conservative interpretation of the clause. The Court held that Congress could only regulate commercial activity, and requiring the purchase of health insurance under the Affordable Care Act was impermissible as it was the regulation of inactivity rather than commercial activity.
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The Dormant Commerce Clause
Courts determine whether a state regulation discriminates against interstate commerce or has the purpose or effect of doing so. If the statute is found to be discriminatory, the state must justify the local benefits of the statute and show that there are no other means of advancing the legitimate local purpose. For example, in West Lynn Creamery Inc. v. Healy, the Supreme Court struck down a Massachusetts state tax on milk products because the tax impeded interstate commercial activity by discriminating against non-Massachusetts citizens and businesses.
The Supreme Court has identified two principles that guide its modern Dormant Commerce Clause analysis. Firstly, states may not discriminate against interstate commerce. Secondly, states may not take actions that are facially neutral but unduly burden interstate commerce. For instance, in Comptroller of the Treasury of Maryland v. Wynne, the Court held that Maryland's practice of taxing the personal income of its citizens earned both in and out of Maryland without providing a tax credit for income tax paid to other states was a violation of the dormant commerce clause.
The idea that the regulation of interstate commerce may be an exclusive federal power was discussed even before the adoption of the Constitution. In 1787, the Framers of the Constitution debated whether to guarantee states the ability to lay duties of tonnage without Congressional interference, so that they could finance the building of lighthouses and the clearing of harbors. The word "dormant", in connection with the Commerce Clause, was first used by Chief Justice John Marshall.
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The Necessary and Proper Clause
The Commerce Clause, outlined in Article 1, Section 8, Clause 3 of the U.S. Constitution, grants Congress the power to "regulate commerce with foreign nations, among states, and with the Indian tribes". The Necessary and Proper Clause, also known as the Elastic Clause, is a key component of the Commerce Clause. It empowers Congress to enact laws that are "necessary and proper" for executing its constitutionally mandated powers.
Another notable case is Gonzales v. Raich (2005), where the Supreme Court ruled that under the Commerce Clause, Congress could criminalize the production and use of homegrown cannabis, even if state law permitted it for medicinal purposes. This case reaffirmed Congress's authority to regulate intrastate activities that could significantly influence interstate commerce. The Court's interpretation of the Necessary and Proper Clause in this context underscores the practical implications of constitutional clauses in governing modern issues.
While the Necessary and Proper Clause grants Congress significant power, it is not without limitations. The Supreme Court has occasionally restricted Congress's use of the Commerce Clause, as seen in United States v. Lopez (1995) and NFIB v. Sebelius (2012). In these cases, the Court asserted that certain laws or mandates could not be justified under the Commerce Clause as they lacked a sufficient connection to commercial or economic activity. These rulings highlight the ongoing debate surrounding the balance of power between the federal government and the states, demonstrating that while the Necessary and Proper Clause confers broad authority, it is subject to judicial interpretation and scrutiny.
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Frequently asked questions
The Commerce Clause, or Article 1, Section 8, Clause 3 of the U.S. Constitution, gives Congress the power to regulate commerce between states. While this has been interpreted broadly throughout history, the Supreme Court has ruled that Congress can regulate intrastate commerce if it is part of a larger interstate commercial scheme. Therefore, states cannot adopt laws that discriminate against intrastate commerce if it interferes with interstate commerce.
Yes, but only if the state can demonstrate that the law serves a legitimate local purpose that cannot be achieved through non-discriminatory means. For example, in the case of state regulation of alcohol, which has been deemed a legitimate local purpose, states can adopt laws that discriminate against imported intoxicating liquors in favour of those of domestic origin.
The Commerce Clause has been interpreted as both a grant of congressional authority and a restriction on the regulatory authority of the states. While the states have the power to regulate intrastate economic activities, the Commerce Clause prevents states from passing legislation that excessively burdens or discriminates against interstate commerce. This includes protectionist policies that favour in-state citizens or businesses over out-of-state competitors.











































