Article III of the U. S. Constitution provides that there shall be one Supreme Court and such inferior courts as Congress should permit. It was the Judiciary Act of 1789 and subsequent legislation that created the system of federal courts that exist...
In addition to the Supreme Court, there are more than 90 district courts in the federal court system, at least one in each state. Most cases end with the district court's decision, but if an appeal is filed, it goes to the appellate court, the next ...