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By 1916, over half of the U.S. states already had statutes that prohibited alcohol. In 1919, the 18th Amendment to the U.S. Constitution, which prohibited the sale and manufacture of alcohol, was ratified. It went into effect on January 16, 1920.
This period of the Eighteenth Amendment to the Constitution banning alcohol is seen as the Noble Experiment, but is officially the Prohibition in the United States. Today you will find out why the United States brought in prohibition, what happened during the prohibition period and why it stopped.y the end of 1917 the new amendment was passed 36 states ratified the amendment. In January 1920 the Eighteenth Amendment to the Constitution came into effect and it was then illegal to sell or manufacture alcohol.