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The inferior courts in the federal system have somewhat less political importance, since their principal duty is to settle routine cases where no constitutional question is at stake. At the ground level are the District Courts with about two hundred district judges scattered over the United States. These courts handle both civil and criminal cases that come under the jurisdiction of the Federal laws. By the Constitution they are required to give a jury trial in all except civil cases involving less than twenty dollars.
The District Courts have original jurisdiction in nearly all cases. That is they collect the facts. The district court is the only Federal court where trials are held, juries are used, and witnesses are called. Criminal cases are tried by a judge sitting with a jury whose duty is to hear the evidence, the speeches of prosecuting and defending counsel, the remarks of the judge and reach a unanimous decision as to whether the accused is guilty or not of the crime he is charged with.