U.S. Courts of Appeals (Circuit Courts)

The United States Courts of Appeals (Circuit Courts) are the intermediate appellate courts of the federal judiciary, established under Article III of the U.S. Constitution to review decisions from the U.S. District Courts and certain federal administrative agencies. They are organized into thirteen circuits: eleven numbered regional circuits covering groups of states, the District of Columbia Circuit with jurisdiction over many administrative law disputes, and the Federal Circuit, which exercises specialized jurisdiction nationwide in matters such as patent law, international trade, and claims against the federal government. Each circuit court is composed of multiple judges who sit in panels, usually of three, although cases of exceptional importance may be reheard en banc by the full court. The jurisdiction of the Courts of Appeals is mandatory appellate jurisdiction, meaning they must hear appeals properly brought before them, though they lack the discretionary docket-setting power of the Supreme Court. Their role is not to conduct trials or hear new evidence but to review alleged legal errors, evaluate the proper application of law, and ensure procedural fairness in the district courts. Decisions of the circuit courts are binding precedent within their respective jurisdictions unless overturned by the Supreme Court. Functionally, the Courts of Appeals serve as the principal gatekeepers of federal law, harmonizing the application of statutes and constitutional principles across districts, while significantly shaping the national legal landscape through their vast volume of precedential rulings.