by Eric Wood
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Three levels, each with a different job. Most federal cases start and end at the first level - very few ever reach the third.
District courts: where federal cases begin
The 94 federal district courts are where federal cases are actually tried - evidence presented, witnesses examined, juries empaneled when a case calls for one. Every state has at least one federal district, and larger states are divided into multiple districts. A district court judge’s decision resolves the case at that level, but it can generally be appealed to the next tier if the losing side believes a legal error occurred.
Circuit courts: reviewing for legal error
The country is divided into 13 federal judicial circuits, each with its own court of appeals. Appellate courts don’t retry the facts of a case or hear new evidence - they review whether the district court applied the law correctly, based on the existing trial record and written legal briefs, generally decided by a panel of three judges rather than a full jury. A circuit court’s rulings become binding precedent for every district court within that circuit, which is why “circuit splits” - different circuits reaching different legal conclusions on the same question - are one of the most common reasons the Supreme Court agrees to take up a case.
The Supreme Court: the final word, rarely used
The Supreme Court sits above all federal circuits and, for certain matters, above state supreme courts as well. It has almost complete discretion over which cases it actually hears, and it exercises that discretion narrowly - out of several thousand petitions filed each year, the Court typically issues full opinions in well under a hundred cases.
Worth knowing
Federal courts exist alongside a completely separate state court system, and most litigation in the country, including nearly all criminal prosecutions, happens in state courts, not federal ones - federal courts generally only have jurisdiction over cases involving federal law, the U.S. Constitution, or disputes between parties from different states above a certain dollar threshold.
Why it still matters
Understanding which level of court is handling a given case explains a lot about what’s actually possible next - a circuit court ruling can create binding precedent for millions of people in that circuit even without the Supreme Court ever weighing in, which is exactly why circuit court appointments carry real, lasting significance of their own.
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The certiorari process, the Rule of Four, and why a circuit split is one of the most common reasons the Supreme Court agrees to take a case at all.
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The power to strike down unconstitutional laws isn't in the Constitution's text at all - how Marbury v. Madison established it, and how far it's expanded since.
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Presidential nomination, Senate confirmation, and lifetime tenure - why Hamilton argued judicial independence required insulating judges from political pressure.
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Article III establishes only 'one supreme Court' directly - how Congress built the rest of the federal court system, and what each level actually does.
