Prohibition began in the United States in 1920 with the ratification of the 18th Amendment, which banned the production, sale, and transportation of alcohol. Prohibition was intended to reduce crime and social issues but instead led to the rise of organized crime and underground speakeasies. By the late 1920s, most Americans no longer supported Prohibition due to its failure to achieve its goals and increase in illegal alcohol consumption. In 1933, the 21st Amendment was ratified to repeal the 18th Amendment, bringing Prohibition to an end.