Federalism & the Commerce Clause
Constitutional Law · Lesson 02
Federalism & the Commerce Clause
這一課問的是：國會是否得依商業條款立此法律？或本法律已逾越州際商業並侵犯州權？
Actor
Act
Object
Standard
Consequence
Visual Scene · the picture in your head
Issue. Does Congress have authority to enact the statute under the Commerce Clause — or does it intrude on areas reserved to the states?
這一課問的是：國會是否得依商業條款立此法律？或本法律已逾越州際商業並侵犯州權？
Core Terminology · 7 must-know
Tap a card to flip and reveal the meaning.
Commerce Clause
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Art I §8 cl 3: Congress may regulate commerce "with foreign Nations, and among the several States."
商業條款。
channels
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Highways, waterways, internet — Congress may regulate.
商業通道。
instrumentalities
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People & things in interstate commerce — Congress may regulate.
商業工具。
substantially affects
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Local activity having substantial economic effect interstate.
實質影響。
aggregation principle
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Local activity may be aggregated to show substantial effect.
集合原則。
Tenth Amendment
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Powers not delegated to US reserved to states.
第十修正案。
anti-commandeering
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Congress may not compel states to enact or enforce federal regulatory programs.
禁徵用州機關。
Issue · what this lesson is really about
Does Congress have authority to enact the statute under the Commerce Clause — or does it intrude on areas reserved to the states?
這一課問的是：國會是否得依商業條款立此法律？或本法律已逾越州際商業並侵犯州權？
Trigger words & phrases that should flag this issue:
channelsinstrumentalitiessubstantially affectseconomic activityaggregation
Expression Bank · how lawyers actually say it
Six function → sentence patterns. Use these in essay applications.
| Function | English sentence | 中文 |
|---|---|---|
| State three categories | Commerce Clause reaches channels, instrumentalities, and activities substantially affecting interstate commerce. | 三類權力。 |
| Apply aggregation | Local economic activity may be aggregated across actors to show substantial effect. | 可集合多人之地方經濟活動。 |
| Note non-economic limit | Non-economic, traditionally local activity cannot be aggregated. | 非經濟、傳統地方活動不可集合。 |
| Apply 10th Am | Congress may not commandeer state legislatures or executive officers. | 國會不可徵用州立法或執行人員。 |
| State result | The statute is therefore (un)constitutional under the Commerce Clause. | 因此本法律(不)合憲。 |
Rule Sentence · the workhorse
Congress may regulate under the Commerce Clause (1) the channels of interstate commerce, (2) the instrumentalities and persons and things in interstate commerce, and (3) activities that, in the aggregate, substantially affect interstate commerce.
Sentence Anatomy · 5 roles, 5 colors
Every rule sentence breaks into five visual roles.
Actor 行為人Congress國會
Act 行為enacting a regulatory statute制定管制法律
Object 對象interstate commerce or affecting commerce州際商業或影響商業
Standard 法律標準three Lopez categories + 10th Am limitsLopez 三類 + 第十限制
Consequence 後果statute is within power or void法律合憲或無效
Casebook Snapshot · a real American case
United States v. Lopez
Holding. Possessing a gun in a school zone is non-economic local activity that does not substantially affect interstate commerce. Congress exceeded its Commerce Clause power; the Gun-Free School Zones Act was struck down. The Court identified three categories of permissible Commerce Clause regulation and reaffirmed that the third (substantial effects) requires economic activity.
Why it matters. Lopez ended a 60-year stretch of unlimited Commerce Clause power. Non-economic local crime is beyond the third category.
Lopez 確立 Commerce Clause 三類並限縮：非經濟活動不入第三類。
Common Mistakes · what trips students
✗ Commerce Clause 範圍無限。
✓ Lopez and Morrison reined in — non-economic activity not reached.
Lopez/Morrison 限縮：非經濟活動不可達。
✗ Congress 可命令州 enforce 聯邦法。
✓ Anti-commandeering bars commandeering.
禁徵用。
✗ aggregation 適用一切。
✓ Aggregation generally limited to economic activity.
集合通常僅限經濟活動。
✗ 10th Am 賦予州禁止 federal 行為之權。
✓ 10th Am preserves residual state power but federal supremacy controls.
第十只保留剩餘權。
Mini IRAC · build the Application
Issue. Is a federal statute criminalizing possession of a firearm within 1,000 feet of a school a valid exercise of Congress's Commerce Clause power?
Rule. Congress may regulate under the Commerce Clause only the channels, instrumentalities, or activities (typically economic) that substantially affect interstate commerce.
Application (model). The statute criminalizes purely local, non-economic conduct — possession of a firearm in a school zone — with no commercial dimension. Because the Commerce Clause's substantial-effects category generally reaches only economic activity, the fact that mere possession in a school zone is a non-economic local activity with no interstate commercial purpose means the regulated conduct falls outside the three Lopez categories.
Pick the right element for each blank:
g1.
g2.
g3.
Conclusion. Therefore, the statute exceeds Congress's Commerce Clause power and is unconstitutional.
MBE Check · multiple choice
Congress enacts a statute commanding all state law enforcement to perform background checks on prospective gun buyers. The statute is challenged. What result?
Mini Essay · write the Application paragraph
Facts. Congress enacts the "Interstate Gender Violence Act," creating a federal civil cause of action against anyone who commits gender-motivated violence. The Act is challenged by D, who is sued under it in federal court.
Call. Is the Act a valid exercise of Congress's Commerce Clause power?
Practice Drill · tap to build the rule
Drop the chips here in correct order:
Tap chips to add → tap chips in the target to remove: