Specie Payment Resumption Act

The Specie Payment Resumption Act of January 14, 1875 was a law in the United States that restored the nation to the gold standard through the redemption of previously unbacked United States Notes and reversed inflationary government policies promoted directly after the American Civil War. The decision further contracted the nation's money supply and was seen by critics as an exacerbating factor of the so-called Long Depression, which struck in 1873.

Source: Wikipedia — Specie Payment Resumption Act (CC BY-SA 4.0)