Which case is associated with limiting the reach of the Commerce Clause by requiring substantial effects on interstate commerce?

• A. Wickard v. Filburn
• B. Heart of Atlanta Motel v. United States
• C. NFIB v. Sebelius
• D. United States v. Lopez

Answer: (D)

The idea being tested is how courts constrain the Commerce Clause by requiring a substantial effect on interstate commerce before Congress can regulate an activity. United States v. Lopez held that the federal Gun-Free School Zones Act went beyond Congress’s Commerce Clause power because merely having a gun in a school zone is not an economic activity with a substantial effect on interstate commerce. The Court stressed that regulation must be tied to an actual economic activity with a real interstate impact, not based on a loose, speculative connection.

This marks a limiting stance on the federal reach of the Commerce Clause, contrasting with Wickard v. Filburn, where regulation was upheld because local activity could be viewed in aggregate as affecting interstate commerce, showing a broad reach. Heart of Atlanta Motel used interstate commerce to justify prohibiting discrimination in public accommodations, illustrating regulation based on economic activity; NFIB v. Sebelius centers on taxing power rather than extending Commerce Clause reach. Therefore, Lopez is the case that sets the limit by insisting on a substantial interstate-commerce connection for regulation.