[NoFunPedant]

1. The states never had the right to secede. U.S. Constitution, Article VI: "This Constitution, and the Laws of the United States which shall be made in Pursuance thereof ... shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding."

Article I, Section 10: "No State shall enter into any Treaty, Alliance, or Confederation .... No State shall, without the Consent of Congress, lay any Duty of Tonnage, keep Troops, or Ships of War in time of Peace, enter into any Agreement or Compact with another State, or with a foreign Power, or engage in War ..."

It is abundantly clear in the records of the Constitutional Convention, the text of the Constitution, the debates on ratification, and the Federalist Papers that the intent of the Constitution was to create a supreme national government, not a league of states.

2. The Constitution explicitly gives Congress the authority to regulate currency. Article I, Section 8: "The Congress shall have power ... To coin Money [and] regulate the Value thereof ..."