Article 1, 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.

1.Deering v. Parker
2.James Madison, Notes for Speech Opposing Paper Money, 1 Nov. 1786
3.Records of the Federal Convention
4.Luther Martin, Genuine Information, 1788
5.James Madison, Federalist, no. 44, 299--302, 25 Jan. 1788
6.Charles Pinckney, South Carolina Ratifying Convention, 20 May 1788
7.Edmund Randolph, Virginia Ratifying Convention, 6 June 1788
8.Debate in Virginia Ratifying Convention, 15 June 1788
9.Debate in North Carolina Ratifying Convention, 29 July 1788
10.Calder v. Bull
11.University of North Carolina v. Fox
12.Fletcher v. Peck
13.Thomas Jefferson to W. H. Torrance, 11 June 1815
14.Gill v. Jacobs
15.Farmers & Mechanics' Bank v. Smith
16.Sturges v. Crowninshield
17.Trustees of Dartmouth College v. Woodward
18.King v. Dedham Bank
19.Ogden v. Saunders
20.Mason v. Haile
21.Craig v. Missouri
22.James Madison to Charles J. Ingersoll, Feb. 1831
23.Joseph Story, Commentaries on the Constitution 3:§§ 1351, 1353--57, 1365--66, 1370--94, 1833