
The US court system is made up of federal and state courts. Federal courts are courts of limited jurisdiction, meaning they can only hear cases authorized by the US Constitution or federal statutes. Federal district courts are the starting point for any case arising under federal statutes, the Constitution, or treaties. Cases that are entirely based on state law may be brought in federal court under the court's diversity jurisdiction. Diversity jurisdiction allows a plaintiff of one state to file a lawsuit in federal court when the defendant is located in a different state. State courts have similar procedures to federal courts, but there are some differences. For example, states are not required to use grand juries, but the federal government must do so under the Constitution. In terms of which court hears cases that involve errors of law, the US Supreme Court is the final judicial arbiter in the US on matters of federal law. However, the Supreme Court rarely hears appeals as a matter of right. Instead, parties must petition the court for a writ of certiorari, which is a document asking the Supreme Court to review the case. Federal courts of appeals also hear cases that involve errors of law, and they handle more than 50,000 cases each year.
| Characteristics | Values |
|---|---|
| Court | Court of Appeals, Circuit Court, Federal Court, District Court, Supreme Court |
| Court's role | Reviews procedures and decisions in district courts to ensure fairness and correct application of the law |
| Caseload | 50,000+ cases per year |
| Appeal rate to Supreme Court | 10% or fewer |
| Hearing rate of oral arguments by Supreme Court | Fewer than 100 cases annually |
| Decision finality | Decisions are usually final and binding on lower courts within the same circuit |
| Judges | Appointed for life by the president and confirmed by the Senate |
| Appeal panel | Consists of three circuit court judges |
| Appeal process | Parties file "briefs" arguing for affirmation or reversal; “oral argument" follows, where lawyers answer judges' questions |
| En banc hearing | Rare process where the entire circuit court considers an appeal |
| Writ of certiorari | Document requesting the Supreme Court to review a case; granted only for new/important legal principles or conflicting interpretations |
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What You'll Learn
- Federal courts hear cases involving federal statutes, the Constitution, or treaties
- Federal appellate courts hear cases involving state laws that violate constitutional rights
- The Supreme Court interprets laws, decides their relevance, and rules on their application
- District courts handle federal cases, with 94 across 12 regional circuits
- Circuit court judges are appointed for life and hear appeals from district courts

Federal courts hear cases involving federal statutes, the Constitution, or treaties
Federal courts are courts of limited jurisdiction, meaning they can only hear cases authorized by the United States Constitution or federal statutes. The federal district court is the starting point for any case arising under federal statutes, the Constitution, or treaties. This type of jurisdiction is called "original jurisdiction".
Article III of the Constitution establishes the federal judiciary. Article III, Section I states that "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." Article III, Section II of the Constitution establishes the jurisdiction (legal ability to hear a case) of the Supreme Court. The Court has original jurisdiction (a case is tried before the Court) over certain cases, e.g. suits between two or more states and/or cases involving ambassadors and other public ministers. The Court has appellate jurisdiction (the Court can hear the case on appeal) on almost any other case that involves a point of constitutional and/or federal law.
The Supreme Court agrees to hear about 100-150 of the more than 7,000 cases it is asked to review each year. The best-known power of the Supreme Court is judicial review, or the ability of the Court to declare a Legislative or Executive act in violation of the Constitution. The Court established this doctrine in the case of Marbury v. Madison (1803).
Federal question jurisdiction is the basis for many of the Supreme Court's high-profile cases. In particular, federal question cases may involve claims of an actual or threatened invasion of the plaintiff's constitutional rights by some act of public authority. Federal question cases may also arise under treaties to which the United States is a party.
Federal courts have exclusive jurisdiction over the federal antitrust laws, even though Congress has not spoken expressly or impliedly. Federal appellate courts also hear habeas corpus appeals involving death penalties issued by state courts, as well as by federal courts.
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Federal appellate courts hear cases involving state laws that violate constitutional rights
Federal appellate courts hear cases that originated in state courts when they involve claims that a state or local law or action violates rights guaranteed under the U.S. Constitution. Federal courts are courts of limited jurisdiction, meaning they can only hear cases authorized by the United States Constitution or federal statutes. The federal district court is the starting point for any case arising under federal statutes, the Constitution, or treaties. This type of jurisdiction is called “original jurisdiction”. Sometimes, the jurisdiction of state courts will overlap with that of federal courts, meaning that some cases can be brought in both courts.
The appellant (petitioner) bears the burden of showing that the trial court or administrative agency made a legal error that affected the district court’s decision. The court of appeals makes its decision based solely on the trial court’s or agency’s case record. The court of appeals does not receive additional evidence or hear witnesses. The court of appeals may review the factual findings made by the trial court or agency, but generally may overturn a decision on factual grounds only if the findings were “clearly erroneous”.
One important category of cases heard by federal appellate courts is habeas corpus cases, which allege improper incarceration, and form the basis of federal appeals of death penalties imposed by state courts. Federal appellate courts also hear habeas corpus appeals involving death penalties issued by state courts, as well as by federal courts. Constitutional cases include some of the most contentious issues considered by the federal Judiciary – freedom of speech and religion, the right to bear arms, search and seizure, right to counsel, and equal protection under the law, just to name a few.
The court hears appeals from the U.S. Court of International Trade, the U.S. Court of Federal Claims, and the U.S. Patent and Trademark Office. It exclusively hears certain types of cases appealed from the district courts, primarily those involving patent laws.
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The Supreme Court interprets laws, decides their relevance, and rules on their application
The Supreme Court is the highest judicial authority in the United States on matters of federal law. Its primary role is to interpret the law and ensure its correct application, rather than conducting trials. The Supreme Court interprets the meaning of laws, decides on their relevance, and rules on how they should be applied in specific cases. This interpretation function is crucial in ensuring uniform legal standards across the nation.
The Supreme Court's caseload primarily consists of appeals. It may consider appeals from the highest state courts or federal appellate courts. However, the Supreme Court is not obliged to hear every appeal. It usually grants a review only when a case involves a significant and novel legal principle or when different interpretations of a law have been made by multiple federal appellate courts.
The Supreme Court's jurisdiction is not limited solely to federal law. It also has original jurisdiction in cases involving ambassadors and other diplomats, as well as in cases between states. This means that the Supreme Court can be the first court to hear certain types of cases, rather than reviewing a lower court's decision.
The Supreme Court's decisions are final and binding on lower courts. This ensures that the law is interpreted and applied consistently across the country. Lower courts are obligated to follow the precedents set by the Supreme Court when making their own rulings. This hierarchical structure in the judicial system helps maintain uniformity and predictability in the law.
The Supreme Court's role in interpreting laws and ruling on their application is a critical aspect of the American judicial system. It ensures that the law is applied fairly and consistently, providing clarity and guidance to lower courts and helping to shape the legal landscape of the nation.
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District courts handle federal cases, with 94 across 12 regional circuits
The federal court system in the United States has three main levels: district courts, circuit courts, and the Supreme Court. There are 94 district courts across the country, which are also known as trial courts. These courts are spread across 12 regional circuits, with at least one district in each state, as well as in the District of Columbia and Puerto Rico. The three territories of the United States—the Virgin Islands, Guam, and the Northern Mariana Islands—also have district courts that hear federal cases.
District courts are responsible for resolving disputes by determining the facts and applying the law to those facts. They have jurisdiction over a wide range of federal cases, including civil and criminal matters. They serve as the starting point for any case arising under federal statutes, the Constitution, or treaties, and this type of jurisdiction is known as "original jurisdiction". In criminal matters, district court judges, or federal magistrate judges, may oversee cases, issue warrants, conduct hearings, set bail, and decide on motions. In civil cases, magistrates often handle pre-trial motions and discovery.
Once a district court has decided a case, it can be appealed to a United States court of appeal, or circuit court. These courts are the first level of appeal and there are 13 of them across the country. Each of the 12 regional circuits has a court of appeals, which hears appeals from district courts within its circuit, as well as appeals from decisions of federal administrative agencies. The court of appeals makes its decision based solely on the trial court’s case record and does not receive additional evidence or hear witnesses.
The final level of appeal in the federal system is the Supreme Court of the United States, the highest court in the American judicial system. The Supreme Court typically hears cases when there are conflicting decisions across the country on a particular issue or when there is an egregious error in a case. The Supreme Court interprets the meaning of a law, decides whether a law is relevant to a particular set of facts, or rules on how a law should be applied.
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Circuit court judges are appointed for life and hear appeals from district courts
Circuit court judges are appointed for life by the president and confirmed by the Senate. They are also referred to as ""Article III judges", and they ""hold their office during good behavior". This means that they have a lifetime appointment, except under very limited circumstances. These judges can be removed from office only through impeachment by the House of Representatives and conviction by the Senate.
Circuit court judges hear appeals from district courts. Any case may be appealed to the circuit court once the district court has finalized a decision. Appeals to circuit courts are first heard by a panel of three circuit court judges. Parties file "briefs" to the court, arguing why the trial court's decision should be "affirmed" or "reversed". After the briefs are filed, the court schedules "oral argument", where the lawyers present their arguments and answer the judges' questions.
The district court is the starting point for any case arising under federal statutes, the Constitution, or treaties. This type of jurisdiction is called "original jurisdiction". Sometimes, the jurisdiction of state courts will overlap with that of federal courts, meaning that some cases can be brought in both courts. The plaintiff has the initial choice of bringing the case in state or federal court. However, if the plaintiff chooses a state court, the defendant may sometimes opt to "remove" the case to federal court.
The U.S. Court of Appeals for the Federal Circuit has nationwide jurisdiction to hear appeals in specialized cases, such as those involving patent laws, and cases decided by the U.S. Court of International Trade and the U.S. Court of Federal Claims.
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Frequently asked questions
A court of appeals reviews the procedures and decisions of district courts to ensure fair proceedings and correct application of the law. They do not retry cases, hear new evidence or witness testimonies, and there is no jury.
A court of appeals hears cases that originated in state courts when they involve claims that a state or local law or action violates rights guaranteed under the U.S. Constitution. They also hear habeas corpus cases, which allege improper incarceration.
The court of appeals may overturn a decision on factual grounds if the trial court's factual findings are found to be "clearly erroneous". The court of appeals usually has the final word in such cases, unless it sends the case back to the trial court for additional proceedings.








































