Prohibition was a 13-year period from 1920 to 1933 where the production, transportation and sale of alcohol was banned nationwide by the 18th Amendment. Known as the "Noble Experiment", it aimed to reduce crime and improve health but failed due to widespread flouting of the law. Speakeasies emerged illegally selling alcohol and bootlegging became common as loopholes were exploited. Ratification of the 21st Amendment in 1933 ended national Prohibition, allowing states to decide to remain "wet" or "dry".