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Power Divided

PLA 2880Activity 4·11 min read

Why it Matters

The Constitution is not just a list of powers; it is a blueprint for how power flows and how it gets checked, and that structure matters as much as the rights it protects. In this course we study Structure and Function alongside Rights, and this is the Structure and Function part. Power is split in every direction: some to the national government and some to the states (federalism), some to Congress, some to the President, some to the courts (separation of powers), with each branch able to push back on the others (checks and balances). These concepts are the wiring behind the walls, and they shape every case and controversy that follows. Structure on paper is half of it; the cases below show the powers in use, tested, and pared back.

Current Context

On February 20, 2026, the Court held 6-3 in Learning Resources v. Trump that the International Emergency Economic Powers Act does not authorize the President to impose tariffs, with Chief Justice Roberts writing that the government’s reading would work a transformative expansion of presidential authority over tariff policy. Four months later the same Court enlarged presidential control in another direction, overruling Humphrey’s Executor in Trump v. Slaughter while leaving a Federal Reserve governor protected in Trump v. Cook, a sequence the National Constitution Center’s term review lays out case by case. One term checked a claimed power, enlarged a second, and preserved a third; sorting out which structural principle governed each outcome is exactly the analysis this activity builds.

Key Concepts

Federalism

The division of power between the national government and the states. Its boundaries are contested in every generation, from McCulloch through NFIB v. Sebelius.

Separation of Powers

The allocation of distinct powers to the legislative, executive, and judicial branches to prevent concentration of authority. Cases in this area ask which branch may do what, and what happens when one branch borrows another’s tools.

Checks and Balances

The mechanisms each branch uses to limit the powers of the others and maintain institutional balance. Judicial review, the veto, impeachment, and confirmation are all checks; the cases test how far each one reaches.

Commerce Clause

The constitutional provision granting Congress the authority to regulate commerce with foreign nations, among the several states, and with the Indian Tribes. It is the single most litigated source of federal legislative power.

Necessary and Proper Clause

The clause empowering Congress to make all laws which are “necessary and proper” for executing its enumerated powers. It serves as the basis for implied powers and did the heavy lifting in McCulloch v. Maryland.

Judicial Review

The principle that empowers courts to review and invalidate actions of the legislative and executive branches if they are found to be unconstitutional. It is the check that makes the other structural limits enforceable in court.

Supremacy Clause

The clause establishing that the Constitution, federal laws, and U.S. treaties are the supreme law of the land, overriding any conflicting state laws. Preemption cases like Arizona v. United States run directly through it.

Resources

Federalism cases (all links open the full opinion on Google Scholar):

  • McCulloch v. Maryland (1819) (The cornerstone of federal power; establishes implied powers through a broad reading of the Necessary and Proper Clause and affirms federal supremacy over conflicting state law.)
  • Gibbons v. Ogden (1824) (Affirms broad federal authority to regulate interstate commerce and strengthens national power over the economy under the Supremacy Clause.)
  • Wickard v. Filburn (1942) (The high-water mark of Commerce Clause authority; Congress may regulate purely local activity that, in aggregate, substantially affects interstate commerce.)
  • South Dakota v. Dole (1987) (Upholds federal conditions on highway funding as a valid use of the Spending Clause.)
  • New York v. United States (1992) (Establishes the anti-commandeering doctrine: the federal government cannot force states to enact or enforce federal policies.)
  • United States v. Lopez (1995) (The first case in nearly 60 years to strike down a federal law for exceeding the Commerce Clause, opening the modern era of limits on national power.)
  • Printz v. United States (1997) (Extends anti-commandeering: the federal government cannot compel state or local executive officers to enforce federal law. The case arose from county sheriffs refusing to run federal background checks, the state-federal enforcement line in its rawest form.)
  • Gonzales v. Raich (2005) (Shows the reach of the Commerce Clause in regulating local activity.)
  • NFIB v. Sebelius (2012) (Limits the Commerce Clause by holding it cannot compel economic activity, and curbs the spending power by deeming the threatened loss of all Medicaid funds unconstitutionally coercive.)
  • Arizona v. United States (2012) (Strikes down key provisions of Arizona’s immigration law as preempted, reinforcing exclusive federal authority over immigration; the Supremacy Clause drawing the line between state and federal enforcement policy.)

Separation of Powers cases:

Checks and Balances cases:

  • Marbury v. Madison (1803) (Establishes judicial review, empowering the Court to declare acts of the other branches unconstitutional.)
  • Martin v. Hunter’s Lessee (1816) (Affirms the Supreme Court’s authority to review state court decisions on federal law.)
  • Ex Parte Milligan (1866) (A judicial check on executive power: civilians cannot be tried by military tribunal where civilian courts are open.)
  • United States v. Nixon (1974) (Limits executive privilege; a generalized claim of confidentiality cannot override the judiciary’s need for evidence in a criminal proceeding.)
  • Lujan v. Defenders of Wildlife (1992) (Clarifies Article III standing: plaintiffs must show concrete injury, causation, and redressability.)
  • Clinton v. City of New York (1998) (Strikes down the Line Item Veto Act as violating the Presentment Clause.)
  • Hamdan v. Rumsfeld (2006) (The executive lacked authority to establish military commissions without congressional approval; even in wartime the President acts within legal constraints.)
  • Massachusetts v. EPA (2007) (Courts can force agencies to act when the law requires it; standing and judicial review in action.)
  • Boumediene v. Bush (2008) (Foreign nationals held at Guantanamo have a constitutional right to habeas corpus to challenge their detention.)
  • Trump v. United States (2024) (Addresses the scope of presidential immunity from criminal prosecution for official acts, a foundational question of executive accountability.)

What to Do

Use AI as your research assistant to analyze how constitutional power is divided, checked, and used. This activity strengthens your grasp of the Key Concepts and trains you to critically evaluate AI-generated legal analysis rather than accept it.

Part 1: Analyze Two Landmark Cases in Each Category

Pick two cases from each grouping in the Resources (Federalism, Separation of Powers, Checks and Balances), six in all. Use the Case Analyzer with your selected AI model to generate a detailed analysis of each. Treat the output as a rough draft: open the actual opinion at the Google Scholar link and fact-check the reasoning and legal accuracy against it. For at least two of your six cases, run the Claim Auditor in a fresh chat first to surface the claims most worth verifying before you check the opinion.

Part 2: Go Deep on One Modern Connection

Choose one of your six cases and use the Modern Connection Finder to tie it to a recent legal or political event. Confirm the event’s existence and relevance independently through your own research. One meaningful current application, examined closely, beats three summarized headlines.

Part 3: Write Your Post

Write a 400–600 word post with three components. Summary: which cases you chose and what you found, highlighting your current-event connection. Snippets: a short excerpt from the AI output for each prompt, with a note on why it stood out. Evaluation: how well the AI performed, where it was accurate and helpful, and where it missed.

Include one AI chat link with a 1–2 sentence explanation of what the conversation shows and why you chose to share it.

Suggested AI Prompts

Use these prompts as a starting point, then adjust them to fit your goal. Strong prompting develops through trial, revision, and testing. It’s a foundational skill that grows into more advanced AI work such as context engineering and agent-based workflows.

The Case Analyzer

You are to act as an expert guide in U.S. Constitutional Law, and your purpose is to help me deeply understand the structural significance of landmark Supreme Court cases. The level of detail and language you use should be appropriate for a college student, providing a thorough but accessible analysis. Please begin our interaction by asking me to provide the name of a case you can help me with. Once I give you the case name, your response must follow a specific, detailed structure. First, identify which core constitutional principle the case primarily addresses, explaining whether it’s a matter of Federalism, Separation of Powers, or Checks and Balances, and briefly state how the case facts raise this issue. Following that, walk me step by step through the legal reasoning of the majority opinion, clarifying the central question and the test the Court applied to reach its holding. You must also detail the arguments from any significant concurring or dissenting opinions, highlighting their fundamental disagreements with the majority’s logic. After breaking down the opinions, zoom out to explain the case’s big-picture significance, detailing its lasting impact on the trajectory of constitutional law and how it concretely shifted the balance of power. If the case has since been narrowed or overruled, say so and name the later decision. To conclude your analysis, formally invite me to ask any follow-up questions I may have. Now, please begin by asking me for a case.

This prompt combines role assignment with a mandated output structure, forcing the model to cover principle, majority reasoning, separate opinions, and significance in order rather than emphasizing whatever it finds most interesting. A structured template also makes gaps and errors easier to spot when you verify against the opinion.

The Modern Connection Finder

You are an AI legal research assistant designed to connect foundational Supreme Court precedents to contemporary legal and political issues. Your primary task is to help me explore the modern relevance of a landmark case by identifying recent events that are shaped by its legacy. The analysis you provide should be in clear, narrative form, suitable for a university student who has a foundational understanding of U.S. government. Please begin our interaction by asking me to provide the name of a United States Supreme Court case. Once I provide the case name, use your web search tool to find accurate and current information from the last two years. Based on your search, identify at least one significant recent event (such as a new court case, a proposed piece of legislation, an executive action, or a major public debate) that is directly related to the precedent of the case I provided. Then structure your explanation in three parts. First, clearly identify the recent development. Second, provide a detailed narrative explaining the direct connection: does the new event apply the original ruling, challenge it, seek to overturn it, or expand upon its logic in a new context? Finally, conclude with a “Big Picture Significance” analysis that explains the broader constitutional theme linking the historical case with the modern event, such as the ongoing tension between national security and individual liberty, the evolving definition of federal power, or the persistent struggle over the separation of powers. Cite the sources you relied on so I can check them. Now, please begin by asking me for the name of the case.

This prompt grounds the model in live sources by requiring tool use and citations rather than letting it answer from memory, where recent events are most likely to be wrong. The three-part structure separates the factual finding from the analytical connection, so you can verify each independently.

The Claim Auditor

You are a skeptical legal editor reviewing an AI-generated analysis of a Supreme Court case for publication. I will paste the analysis below. Your job is not to praise it but to audit it. Identify the five specific claims in the analysis that are most likely to be wrong, imprecise, or hallucinated, prioritizing holdings stated too broadly, tests attributed to the wrong case, vote counts, authorship of opinions, characterizations of dissents, and claims that a case remains good law when it may have been narrowed or overruled. For each claim, state exactly what I should look for in the actual opinion to confirm or refute it, and rate your own confidence that the claim is accurate as high, medium, or low. Do not rewrite the analysis; produce only the audit list.

Red-teaming a model’s output with a second, adversarial pass works against the default tendency toward validation, and the confidence ratings surface uncertainty the original analysis hid. The audit list then becomes your verification checklist when you open the real opinion, building source-checking into the workflow instead of treating the AI as an authority.

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