What does the Supremacy Clause do?

• A. A clause about federalism separation
• B. A clause limiting state taxation
• C. A clause establishing judicial review
• D. A clause in the U.S. Constitution that makes the Constitution, national laws, and treaties supreme over state laws when the national government is acting within its constitutional limits

Answer: (D)

The main idea tested is that when the national government acts within its constitutional powers, the Constitution, federal laws, and treaties are the supreme law of the land, binding on state governments. This makes sure there’s a single, consistent legal framework across the country and prevents state laws from conflicting with valid federal measures. A classic illustration is that states cannot impede a legitimate federal interest—such as taxing or regulating a federal instrument—because federal law overrides conflicting state law.

Treaties are included in this supremacy, standing on the same level as federal statutes. But the clause only applies to actions within the powers granted to the federal government by the Constitution; it doesn’t authorize unconstitutional federal action, and it doesn’t by itself address how states handle taxation or the broader concept of judicial review.