The Compact Clause in the U.S. Constitution requires approval by Congress of any agreement among states to increase their power at the expense of federal power. A comparable prohibition had been in the Articles of Confederation, but the Framers chose even stronger language for the U.S. Constitution: | The Compact Clause in the U.S. Constitution requires approval by Congress of any agreement among states to increase their power at the expense of federal power. A comparable prohibition had been in the Articles of Confederation, but the Framers chose even stronger language for the U.S. Constitution: |