The cases arose from the issuance of "[[greenbacks]]" during the Civil War and the [[Legal Tender Act]] of 1862, which declared that this government money must be accepted for all debts, public and private. In ''Hepburn v. Griswold'' (1870), the U.S. Supreme Court invalided the law as applied to pre-existing debts as a violation of the [[Obligation of Contract Clause]]. | The cases arose from the issuance of "[[greenbacks]]" during the Civil War and the [[Legal Tender Act]] of 1862, which declared that this government money must be accepted for all debts, public and private. In ''Hepburn v. Griswold'' (1870), the U.S. Supreme Court invalided the law as applied to pre-existing debts as a violation of the [[Obligation of Contract Clause]]. |