What is the primary significance of the Commerce Clause?

• A. It gives Congress the power to regulate interstate commerce.
• B. It restricts Congress to regulate only intrastate commerce.
• C. It reserves trade regulation entirely to the states.
• D. It limits the President's authority over economic policy.

Answer: (A)

Regulating interstate commerce is the central idea. The Commerce Clause gives Congress authority to regulate trade that crosses state lines, as well as trade with foreign nations and with Indian tribes. This power creates a single national market and prevents states from enacting laws that fragment or burden cross-state commerce. Because of this, Congress can set uniform rules and address economic activities that affect more than one state, even extending to activities with substantial effects on interstate commerce through implied powers.

Think of early cases like Gibbons v. Ogden, which confirmed that navigation between states falls under federal regulation, and later decisions such as Wickard v. Filburn, which broadened the reach to include seemingly local activity that has a substantial effect on interstate commerce. The clause also played a role in civil rights protections by linking discriminatory practices in commerce to federal authority to regulate that commerce.

The other statements don’t fit because the Commerce Clause does not limit Congress to intrastate commerce, it does not reserve trade regulation to the states, and it does not describe presidential limits on economic policy.