Which amendment introduced prohibition in the United States?

The 18th Amendment to the United States Constitution introduced prohibition, banning the manufacture, sale, and transportation of alcoholic beverages. Ratified in 1919, this amendment was a culmination of the temperance movement, which sought to reduce alcohol consumption due to its perceived social and moral ills. The amendment came into effect in January 1920, leading to a period known as Prohibition, during which the production and distribution of alcohol were illegal.

This amendment was significant as it aimed to address issues such as crime, family violence, and the social problems associated with alcohol consumption. However, Prohibition ultimately led to a range of unintended consequences, including the rise of organized crime and illegal speakeasies. The challenges of enforcing the amendment became apparent over the years, leading to its repeal by the 21st Amendment in 1933.