This document summarizes Prohibition in the United States and its repeal via the 21st Amendment. It discusses how the Temperance movement led to the 18th Amendment banning alcohol nationwide in 1919. Enforcement of Prohibition spawned organized crime groups like Al Capone's who profited from bootlegging. Prohibition became unenforceable with widespread corruption and deaths from illegal alcohol. It was repealed by the 21st Amendment in 1933 as the Great Depression increased demand for jobs and tax revenue from legal alcohol. Prohibition failed because it turned law-abiding citizens into criminals and was too difficult to enforce while empowering gangsters.