How many Courts of Appeal have been created by Congress in the United States under its constitutional authorization?

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Under its constitutional authorization, Congress has created 12 U.S. Courts of Appeal plus a special Court of Appeals for the Federal Circuit as intermediate appellate courts in the federal system. This special reviewing court, located in Washington, D.C., hears appeals from special courts such as the U.S. Claims Court and Contract Appeals as well as from administrative decisions such as those made by the Patent and Trademark Office.

How Many Courts of Appeal Have Been Created by Congress