why did prohibition pass
Prohibition summary The noble experiment of Prohibition was introduced by the 18th Amendment, which became effective in January 1920. Here are four reasons why Prohibition was introduced: 1  National mood - when America entered the war in 1917 the national mood also turned against drinking alcohol. 2  Practical - a ban on alcohol would boost supplies of important grains such as barley. 3  Religious - the consumption of alcohol went against God's will.