The 18th amendment, known as Prohibition, was enacted in the United States from 1920 to 1933. The temperance movement gained momentum in the late 19th century, with certain states and localities banning alcohol. Pro-Prohibition groups included Protestant churches, the WCTU, and the Anti-Saloon League. They used communication efforts like scolding customers and disrupting saloons. The amendment was ratified in 1919 and banned the manufacture and sale of alcohol nationwide. However, Prohibition faced opposition and was later repealed by the 21st amendment in 1933.