George Boutwell in the context of "Impeachment trial of Andrew Johnson"

The Coinage Act of 1873 or Mint Act of 1873 was a general revision of laws relating to the Mint of the United States. By ending the right of holders of silver bullion to have it coined into standard silver dollars, while allowing holders of gold to continue to have their bullion made into money, the act created a gold standard by default. It also authorized a Trade dollar, with limited legal tender, intended for export, mainly to Asia, and abolished three small-denomination coins. The act led to controversial results and was denounced by critics as the "Crime of '73".

By 1869, the Mint Act of 1837, enacted before the California gold rush or the American Civil War affected the monetary system of the United States, was deemed outdated. Treasury Secretary George Boutwell had Deputy Comptroller of the Currency John Jay Knox draft a revised law, introduced into Congress by Ohio Senator John Sherman. Silver's market price then exceeded the value at which the Mint would purchase the metal, suppressing the demand for bullion to be struck into silver dollars. However, Knox and others correctly forecast that development of the Comstock Lode and other rich silver mines would lower silver's market price, making the option of having bullion struck into legal-tender coins attractive. Congress considered the bill for almost three years before passage. During its consideration, it was rarely publicly mentioned, but also was not concealed, that the bill would establish a gold standard by ending bimetallism. The bill became the Act of February 12, 1873, with the signature of President Ulysses S. Grant, and became effective on April 1 of that year.