There were two main reason why prohibition failed.

Firstly there was not enough officials to enforce the law. America’s border is 32000 km long and its population was over 100 million.

However there were only 4500 prohibition agents.

Secondly, criminal gangs moved into the business and made a fortune. Therefore they could bribe officials and so the crime wave could not be stopped by the corrupt government.

Why else did Prohibition fail?