US Constitution

A short document that runs everything

Print the Constitution and you have a pamphlet. Print what the Supreme Court has said about it and you fill a shelf. That gap is where constitutional law actually lives, and it is why this reading spends as much time on how to read an opinion as on what the document says. The activity then puts the method to work: scan cases, brief four, read one opinion in full, and check what you were told against the text.

The Constitution is the supreme law of the United States, and its full text (opens in a new tab) runs only a few thousand words. It reads like an outline rather than a code. That brevity was deliberate, and it has a consequence: most of what the Constitution means has been settled later, one case at a time. So a constitutional argument is rarely a fight about the words alone. It is a fight about how the words have been read, which is why this activity sends you to the opinions.

The Constitution does four distinct kinds of work, and the cases in the activity sort the same way. Two of them concern the structure of power: how it splits among the branches, and how it divides between the nation and the states. A third concerns supremacy, meaning which law prevails in a conflict and who decides. The fourth concerns the rights no part of the government may cross. The sections below take them in that order.

How the Constitution divides power

Separation of powers is the horizontal split. Congress writes the law, the executive enforces it, the courts say what it means, and each branch holds checks on the other two. The design assumes ambition will push against ambition, so no single branch runs the whole show. The hard cases today rarely look like a naked grab of power. They come out of the administrative state, where agencies write and enforce rules under authority Congress delegated to them. When an agency does something that looks legislative, the question is whether Congress could hand that power over at all, and how far.

Federalism is the vertical split, authority divided between the national government and the states. The federal government holds enumerated powers, the ones the Constitution lists, and the states keep the rest. The line moves with the subject. The Commerce Clause, which lets Congress regulate commerce among the states, has carried most of the growth of federal power. The fights over how far it reaches run from wheat grown to feed a farmer’s own livestock to a requirement that individuals buy health insurance. The Constitution Annotated (opens in a new tab) is the tool for finding which clause a case turns on and how the Court has read it over time.

Supremacy, and the power to enforce it

Structure settles nothing without a rule for conflicts. The Supremacy Clause in Article VI supplies one: the Constitution and valid federal law prevail over conflicting state law. When a state rule collides with a constitutional federal one, the state rule yields. That rule is what keeps fifty states inside a single legal system.

A limit on paper still needs an enforcer. Judicial review is the power of a court to measure a law or an official act against the Constitution and refuse to enforce it when the two conflict. The Constitution never spells that power out. The Supreme Court claimed it in 1803 in Marbury v. Madison (opens in a new tab), reasoning that saying what the law is belongs to the courts. Judicial review is the hinge of the whole system. Without it the Constitution’s limits would be advice, and with it they bind, which is why so many of the cases you scan come down to what a court may strike down.

The rights the government cannot cross

The first three functions describe machinery. The fourth draws a boundary around a person. Fundamental rights are the liberties that receive the strongest constitutional protection, and they come from two places. Some are named outright in the Bill of Rights. Others the Court has found to be deeply rooted in the nation’s history and tradition, and implicit in the concept of ordered liberty. The Due Process and Equal Protection Clauses are where much of that protection lives.

The hard part is the boundary itself. Deciding what counts as fundamental, especially for a right the text never names, is one of the most divisive tasks the Court has. The Justices split over the method as sharply as over the result. Watch for that move when you brief a rights case. The Court is often deciding two things at once: who wins, and what the test for a protected right should be.

Reading a case: the brief and the holding

Knowing the four functions tells you what a case is about. Reading the case is a separate skill, and it starts with the case brief: a short, structured summary of an opinion, giving its facts, the legal issue, the holding, and the reasoning. Writing one forces you to pull the decision loose from the story and the rhetoric wrapped around it.

The part that carries the weight is the holding, the specific rule the court adopts to decide the dispute in front of it. An opinion says far more than that. Courts work through hypotheticals and asides the decision never required, and that material is dicta, which does not bind a later court the way the holding does. Telling the two apart is what lets you predict how a case applies to the next set of facts, and it is the hardest move in reading an opinion. A summary will hand you a holding. Whether it handed you the right one is a question only the opinion answers.

Why you read the opinion yourself

Here is where the method pays off. An AI tool, a study aid, or a headline hands you a clean summary of a case, and clean is exactly the risk. A fractured decision comes back as one tidy sentence. The wrong Justice gets credit for a line. A quote arrives stripped of the paragraph that gave it meaning. The opinion is the authority, and the summary is only someone’s report of it.

So the activity ends in verification. You will pull a real opinion from Google Scholar (opens in a new tab) or Cornell’s Supreme Court collection (opens in a new tab) and read it yourself. Then you take the load-bearing quote and check it word for word: who actually wrote it, and whether the paragraph around it changes what it means. Attorneys have drawn sanctions for citing cases that held something other than what a summary promised. Your work in the activity starts wide, with the Case Scanner across ten cases, and it ends on one opinion you can vouch for.