The Federal Courts
Ninety-four trial courts, thirteen appeals courts, and one Supreme Court — each built to answer a different question about the same case.
People talk about “the courts” as one thing, but the federal judiciary is a ladder with a specific job on every rung. Trial courts figure out what happened and apply the law to it. Appeals courts check whether the law was applied correctly. The Supreme Court decides which of the country’s hardest unsettled legal questions need one national answer. Very few cases climb all three rungs — and that is by design, not failure.
The judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish.
U.S. Constitution, Article III, Section 1
How Courts Actually Work
A court does not go looking for problems to solve. Federal courts decide cases and controversies — real disputes between real parties — and only after answering a set of threshold questions that often matter as much as the headline issue:
Standing
Is the person suing actually harmed in a way the law recognizes? Being upset about a policy usually isn’t enough.
Ripeness and mootness
Is the dispute ready to decide — and still alive? Courts avoid questions that are premature or already over.
Jurisdiction
Does this particular court have legal authority over this kind of case and these parties?
Only after those questions are settled does a court reach the merits — what the law actually requires. A surprising number of high-profile cases end on a threshold question, which is why a ruling can leave the big policy issue untouched.
District Courts — Where Cases Start
The 94 federal district courts are the trial courts of the federal system, with at least one in every state plus the District of Columbia, Puerto Rico, and three territories. This is where the record gets built: complaints and charges are filed, parties exchange evidence in discovery, judges rule on motions, witnesses testify, and a judge or jury reaches a verdict. A single judge usually presides.
Pleadings
A civil complaint or a criminal indictment starts the case; the other side responds.
Motions & discovery
Parties gather evidence and ask the judge to dismiss, narrow, or decide issues early.
Trial & judgment
If nothing resolves it first, a judge or jury decides the facts and the court enters judgment.
Most federal cases never reach a trial
The trial is the exception, not the rule. The large majority of federal civil cases settle or are dismissed before trial, and the large majority of federal criminal cases end in a guilty plea rather than a jury verdict. District judges spend far more of their time managing motions, settlements, and sentencing than running trials.
Courts of Appeals — Checking the Work
The 13 U.S. courts of appeals sit above the district courts. Twelve are organized by geography (the First through Eleventh Circuits plus the D.C. Circuit); the thirteenth, the Federal Circuit, hears certain subject-matter appeals nationwide, such as patent cases. Cases are usually heard by a panel of three judges.
Appeals courts do not hold new trials or hear new witnesses. They read the record from below, read the parties’ written briefs, sometimes hear oral argument, and decide whether the lower court got the law right. For most parties this is the last stop: the Supreme Court reviews only a tiny fraction of appellate decisions, so a circuit court’s ruling is usually the final word.
An appellate decision usually ends with one short word that carries a lot of weight:
Affirm
The lower court’s decision stands, to the extent the appeals court says so.
Reverse
The appeals court rejects the lower court’s decision on the issue it reviewed.
Vacate
The lower court’s judgment is wiped out — often so the question can be decided again under the correct legal standard.
Remand
The case goes back down for more proceedings. A remand frequently starts a new phase of the case rather than ending it.
Federal Jurisdiction — Which Cases Belong Here
Federal courts are courts of limited jurisdiction: they can hear only the kinds of cases the Constitution and Congress assign them. The two biggest doorways are:
Federal-question cases
Claims that arise under the Constitution, a federal statute, or a treaty — a civil-rights lawsuit, a federal crime, a challenge to an agency rule.
Diversity cases
State-law disputes between citizens of different states, when the amount at stake exceeds $75,000 — a rule designed to give out-of-state parties a neutral forum.
Some matters belong only in federal court (exclusive jurisdiction) — bankruptcy, patents, and federal crimes among them. Many others can be heard in either system (concurrent jurisdiction). A case does not become federal just because it is important, involves a public official, or mentions the Constitution in passing.
Types of Cases
The same event can produce very different legal proceedings. A workplace injury might lead to a civil lawsuit, a criminal investigation, an administrative claim, or nothing at all — and each follows different rules.
Civil cases
One party seeks a remedy from another — money damages, an order to stop doing something, or a declaration of rights. The usual standard is preponderance of the evidence: more likely than not.
Criminal cases
The government prosecutes someone for violating a criminal law. The government must prove guilt beyond a reasonable doubt, and the accused has constitutional protections civil parties don’t.
Within those two categories, federal courts regularly see constitutional challenges to laws and government action, civil-rights claims, challenges to federal agency decisions, bankruptcy, immigration-related matters that reach the courts of appeals, and disputes between states. Two cautions apply to everything above: an allegation in a complaint or indictment is not a finding of fact, and a settlement or a not-guilty verdict is not a sweeping declaration about everything that happened.
State Courts and Federal Courts
The United States runs two court systems side by side. Every state has its own courts, created by its own constitution, and together they handle the overwhelming majority of American legal business — most crimes, contracts, family law, probate, traffic, and personal-injury cases. Federal courts handle the narrower set of cases described above.
The systems meet in predictable places. State courts decide federal-law questions all the time. A defendant sued in state court can sometimes remove the case to federal court if it could have been filed there originally. And the U.S. Supreme Court can review a state supreme court’s decision — but only on questions of federal law, never on what state law means. On state law, a state’s highest court has the last word.
How Precedent Works
Courts are expected to decide like cases alike. Under the principle of stare decisis (“let the decision stand”), earlier rulings guide later ones:
Binding, from above
Supreme Court decisions bind every court on questions of federal law. A circuit’s decisions bind the district courts within that circuit.
Persuasive, from the side
A court may learn from another circuit or a state court’s reasoning, but it isn’t obligated to follow it.
Holding vs. dicta
Only the rule necessary to decide the case — the holding — binds. Side comments (dicta) can be influential but aren’t law.
When two circuits read the same federal law differently, the result is a circuit split — the same statute meaning different things in different parts of the country. Resolving splits is one of the most common reasons the Supreme Court agrees to hear a case.
Precedent can change. The Supreme Court can overrule its own earlier decisions, and it weighs factors like how workable the old rule has been and how much people have relied on it — a debate laid out at length in Planned Parenthood v. Casey. A recent example: in 2024 the Court overruled the 40-year-old deference framework of Chevron v. NRDC.
Specialized Courts
Congress has also created courts for particular subjects, including the U.S. Court of International Trade, the U.S. Court of Federal Claims (money claims against the federal government), bankruptcy courts attached to each district, the U.S. Tax Court, and the Court of Appeals for Veterans Claims. Some of their judges serve fixed terms rather than for life, and their decisions follow their own routes of appeal — so when a document comes from one of these courts, check which rules govern it before assuming it works like a district court.