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The Prohibition Era was a period in United States history when alcohol was outlawed. People were not allowed to drink it. Police would arrest anyone who was found making or selling alcohol illegally. It lasted from 1920 to 1933. It was established by the Eighteenth Amendment to the United States constitution. It was ratified (approved by the states) by January 16, 1919. It came into effect at January 16, 1920. It was repealed December 5, 1933 by the Twenty-first Amendment. Prohibition was good as the consumption of alcohol was reduced, but it was bad in that underground organizations that sold liquor grew and made trouble. Now states can regulate the selling of liquor by themselves.