Goldie Locks

and the Bulls and Bears
Coinage Act of 1873 From Wikipedia,
The Fourth Coinage Act was enacted by the United States Congress in 1873 and embraced the gold standard and de-monetized silver. Western mining interests and others who wanted silver in circulation years later labeled this measure the "Crime of '73". Gold became the only metallic standard in the United States.
Following the lead of Britain, most major nations in the period also demonetized silver and moved to a gold standard, including Germany, France, Russia, Italy and smaller counties. By 1880 the only large countries still on the silver standard were India and China.
The act (H. R. 2934) also placed the United States Mint within the United States Department of the Treasury, and specified four United States mints at Philadelphia, San Francisco, Carson City, and Denver, and two assay-offices at New York and Boise City, Idaho.
H. R. 2934 was a very lengthy bill written in 67 sections which filled 35 pages in the House Journal on May 27, 1872. When presented to President Grant, he promptly signed it into law on February 12, 1873.