15 December 1791
The Seventh Amendment continues a practice from English common law of distinguishing civil claims which must be tried before a jury (absent waiver by the parties) from claims and issues that may be heard by a judge alone. It only governs federal civil courts and has no application to civil courts set up by the states when those courts are hearing only disputes of state law. [Cornell]
Amendment VII
In suits at common law, where the value in controversy shall exceed twenty dollars, the right of trial by jury shall be preserved, and no fact tried by a jury, shall be otherwise reexamined in any court of the United States, than according to the rules of the common law.