The period from 1920 to 1933 when the manufacture and consumption of alcohol were banned across America by the federal government
Supporters of Prohibition saw it as a noble cause, but it ultimately failed and had to be repealed
Groups who wanted alcohol banned
Socialcampaigners who worried about the social impact of drunkenness, crime, violence and domestic abuse
Temperance societies such as the Woman'sChristianTemperanceUnion which opposed alcohol for religious and moral reasons
Some business leaders who believed that alcohol lessened the efficiency of their workers
The Anti-Saloon League which was the most successful group to organise politically to put pressure on the government to ban alcohol
Dries
Groups that wanted to ban alcohol
Wets
Groups that wanted to keep the freedom to consume alcohol
18th Amendment
Made illegal the "manufacture, sale and transportation of intoxicating liquors", which were defined as drinks with at least 0.5 per cent alcohol by volume
President Herbert Hoover called Prohibition "the Noble Experiment"
Supporters believed that problems in society caused by alcohol could be solved by government legislation
The 1919 Volstead Act was passed by Congress to implement Prohibition
Prohibition was very unpopular as many people believed it went against the principle of personal liberty
Ways Prohibition was evaded
Bootleggers smuggled alcohol into America from abroad
Distillers illegally produced alcohol known as moonshine
Illegal bars and nightclubs known as speakeasies grew in popularity
In New York City there were twice as many bars in 1929 than before Prohibition began
The Wickersham Commission reported in 1929 that Prohibition was not working</b>
Reasons Prohibition failed
Prohibition was almost impossible to enforce
Many offenders went unpunished or were even protected by enforcement officials
It was very difficult to prevent alcohol being smuggled into America
Many Americans did not support Prohibition and they still continued to drink at home or in speakeasies
Organised crime
The huge increase in criminal activity and the growth of powerful gangsters and gangs
Gangsters such as Al Capone had reportedly earned around $60 million (around £700 million today) by the mid-1920s
Towards the end of the 1920s, there had been hundreds of gang-related murders in Chicago alone
Much of the criminal activity went unpunished as there was widespread corruption across the legal, justice and political systems