Not to Make Treaties, Coin Money, Pass Ex Post Facto Laws, Impair Contracts

Article 1 - Legislative
Section 10
Clause 1

No State shall enter into any Treaty, Alliance, or Confederation; grant Letters of Marque and Reprisal; coin Money; emit Bills of Credit; make any Thing but gold and silver Coin a Tender in Payment of Debts; pass any Bill of Attainder, ex post facto Law, or Law impairing the Obligation of Contracts, or grant any Title of Nobility.