How have constitutional provisions like the commerce, necessary-and-proper, and supremacy clauses, and Supreme Court rulings such as McCulloch v. Maryland and United States v. Lopez, shaped the balance of power between the nation and the states?
Topic 1.8 Constitutional Interpretations of Federalism: explain how the appropriate balance of power between national and state governments has been interpreted differently over time.
A focused answer to AP US Government Topic 1.8: the commerce, necessary-and-proper, supremacy, and Tenth Amendment clauses, and how McCulloch v. Maryland and United States v. Lopez interpreted the national-state balance, with the SCOTUS Comparison skill.
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What this topic is asking
Topic 1.8 asks how the balance between nation and states has been interpreted over time, mostly by the Supreme Court reading a handful of key clauses. The College Board pairs this topic with two required cases, McCulloch v. Maryland and United States v. Lopez, which pull in opposite directions and are perfect for the SCOTUS Comparison FRQ.
The clauses that decide federalism cases
These clauses are in tension. The commerce and necessary-and-proper clauses push power upward to the nation; the Tenth Amendment pushes it back to the states. How the Court reads them at a given moment sets the federal balance.
McCulloch v. Maryland (1819): expanding national power
United States v. Lopez (1995): limiting national power
Reading the two together
Put side by side, the cases tell the story of the topic:
- McCulloch broadened national power through implied powers and supremacy.
- Lopez narrowed it by insisting the commerce power has limits and reserving non-economic, local matters to the states.
This pairing is the exam's favorite SCOTUS Comparison: both involve the scope of national power, but they reach opposite conclusions, which makes the comparison sharp.
Why this matters for the exam
The required cases must be known by name, facts, holding, and constitutional clause, because the SCOTUS Comparison FRQ gives you one required case and asks you to compare it to a second case or scenario. Topic 1.8 supplies the two federalism cases you are most likely to see.
Try this
Q1. Name the two clauses central to McCulloch v. Maryland. [Recall]
- Cue. The necessary-and-proper (elastic) clause and the supremacy clause.
Q2. Explain how United States v. Lopez limited national power. [Short explanation]
- Cue. The Court held that possessing a gun near a school was not interstate commerce, so the law exceeded Congress's commerce power and intruded on reserved state powers.
Exam-style practice questions
Practice questions written in the style of College Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AP 2019 (style)4 marksUnited States v. Lopez (1995) is a required Supreme Court case. A. Identify the constitutional clause that was central to both McCulloch v. Maryland (1819) and United States v. Lopez (1995). B. Explain how the holding in Lopez differed from the trend established in McCulloch. C. Explain how a state could use the reasoning in Lopez to resist a federal law.Show worked answer →
A SCOTUS Comparison FRQ, which compares a required case to a described scenario or second case (typically 4 points).
A. Identify: McCulloch turned on the necessary-and-proper clause and the supremacy clause; Lopez turned on the commerce clause. The shared theme is the scope of implied and enumerated national power.
B. Explain the difference: McCulloch broadened national power (Congress may create a bank under implied powers); Lopez limited it, holding that carrying a gun near a school was not interstate commerce, so the Gun-Free School Zones Act exceeded the commerce power.
C. Explain state use: a state could argue, following Lopez, that an activity is local and non-economic, so it falls under reserved powers rather than the commerce clause.
Markers reward correctly stating each holding and its constitutional basis, then drawing the comparison.
AP 2022 (style)6 marksDevelop an argument about whether the Supreme Court has done more to expand or to limit national power in its federalism decisions. Use at least one piece of evidence from one of the following: the Constitution of the United States or Federalist No. 51. Provide a defensible thesis, evidence and reasoning, and a response to an opposing perspective.Show worked answer →
An Argument Essay FRQ, 6-point rubric.
Thesis (1): e.g. "On balance the Court has expanded national power, because McCulloch and broad commerce-clause readings outweigh occasional limits like Lopez."
Evidence (up to 3): the necessary-and-proper and supremacy clauses; the commerce clause of Article I, Section 8; Federalist No. 51 on the national-state division.
Reasoning (1): explain how implied powers and a broad commerce reading enlarged national authority.
Alternative perspective (1): concede that Lopez and the Tenth Amendment set limits, then argue the long-run trend favors expansion.
Related dot points
- Topic 1.7 Relationship Between the States and Federal Government: explain how societal needs affect the constitutional allocation of power between the national and state governments.
A focused answer to AP US Government Topic 1.7: how federalism divides power through enumerated, reserved, and concurrent powers, the Tenth Amendment, and how categorical and block grants, mandates, and revenue sharing shape national-state relations.
- Topic 1.9 Federalism in Action: explain how the distribution of powers among three federal branches and between national and state governments impacts policymaking.
A focused answer to AP US Government Topic 1.9: how federalism plays out in real policy through the commerce clause, the Fourteenth Amendment, mandates, and grants, and how the balance of power shifts in areas like environmental, education, and marijuana policy.
- Topic 1.6 Principles of American Government: explain the constitutional principles of separation of powers and checks and balances, and how Federalist No. 51 addresses the dangers of tyranny.
A focused answer to AP US Government Topic 1.6: separation of powers, checks and balances, and the argument of Federalist No. 51, with concrete examples of how each branch checks the others and why this design protects against tyranny.
- Topic 1.3 Government Power and Individual Rights: explain the relationship between key provisions of the Articles of Confederation and the debate over the balance between government power and individual rights.
A focused answer to AP US Government Topic 1.3: the Federalist and Anti-Federalist debate over balancing government power against liberty, the arguments of Federalist No. 10, Brutus No. 1, and Federalist No. 51, and why the Bill of Rights was the price of ratification.
- Topic 1.5 Ratification of the U.S. Constitution: explain the relationship between the compromises of the Constitutional Convention and the debate over the ratification of the Constitution.
A focused answer to AP US Government Topic 1.5: the Great (Connecticut) Compromise, the Three-Fifths Compromise, and the compromise over the slave trade, plus the Electoral College and amendment process that made ratification of the Constitution possible.
Sources & how we know this
- AP United States Government and Politics Course and Exam Description — College Board (2020)