The Gold Standard Act was an Act of the United States Congress, signed by President William McKinley and effective on March 14, 1900, defining the United States dollar by gold weight and requiring the United States Treasury to redeem, on demand and in gold coin only, paper currency the Act specified.
The Act formalized the American gold standard that the Coinage Act of 1873, which demonetized silver, and the Resumption Act of 1875, which made all legal tender notes redeemable in gold at the Treasury, had established by default. Before and after the Act, silver currency including silver certificates and the silver dollar circulated at face value as fiat currency not redeemable for gold.