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In the Federal Court System, the US District Courts ARE the lowest level of court, and have original jurisdiction (over FEDERAL offenses) within their assigned districts (of which, I believe, there are 94).
State courts, by far, hear more cases per year than all of the Federal Circuits combined.
There are 13 federal judicial circuits in the United States. This includes 12 regional circuits, which hear appeals from federal district courts, and the Federal Circuit, which has specialized jurisdiction over certain cases, including patent law. Each circuit has its own Court of Appeals that reviews decisions made by lower courts within its jurisdiction.
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There are eleven numbered circuits, each of which has a United States Court of Appeal, and the U.S. Court of Appeal for the District of Columbia Circuit. There are two specialized U.S. Courts of Appeal, the U.S. Court of Appeal for the Federal Circuit and the U.S. Court of Appeal for the Armed Forces.
The federal court system comprises the Supreme Court, circuit courts of appeal, and district courts. There are also specialized federal courts.
Federal district courts have jurisdiction over trials. Federal appeals courts have jurisdiction over appeals from the federal district courts.
The Constitution established only one federal court in the Judicial Branch, the Supreme Court. It left to Congress' discretion the creation of other federal courts under its authority in Article III (the constitutional courts) and Article I.The three most widely used courts in the federal judiciary are:US District Courts: The US and its territories are divided into 94 federal judicial districts, each with its own district court. These are the courts where cases are tried.US Court of Appeals Circuit Courts: The District Courts are divided among 12 geographical regions, called Circuits. Each circuit has its own Court of Appeals. There is also a thirteenth Circuit, the Federal Circuit which has nationwide jurisdiction over special subject matter, such as cases from the US Court of Federal Claims. If a person looses a case in the district court that person can appeal the case to the appropriate Court of Appeals Circuit Court.Supreme Court of the United States: The Supreme Court is the highest of the federal courts. Cases from the Circuit Courts and those involving federal question jurisdiction from the state supreme courts can be appealed to the Supreme Court.
There are 94 US District Courts located within 12 regional circuits. A federal case will be brought to a district court located within its regional circuit.
Federal courts do a lot of things. They hear cases just like state courts, but operate in a different system. They are allowed to hear different kinds of cases than state courts (like if the issue is about the constitution). Also, if the parties in a case are citizens of different states (this is called "diversity") the case is started in a federal court system.
There are two lower federal court systems. One is the United States District Courts, of which there are 94 district and territorial courts through the United States and its territories and possessions. These are usually considered trial courts. Above the federal district courts are the United States Courts of Appeal, of which there are 13 circuits, numbered one through eleven, and the United States Court of Appeal for the District of Columbia Circuit and the United States Court of Appeal for the Federal Circuit. These are usually considered appellate courts, to which cases decided by the district courts are, in some cases, appealed to. The 11 circuit courts and the District of Columbia circuit court are courts that have geographical areas of jurisdiction, and the U.S. Court of Appeal for the Federal Circuit is an appellate court having certain subject-matter jurisdiction.