The correct answer is: "18th Amendment"
The 18th Amendment to the US Constitution was ratified in 1919 and it finally recognized the claims made by the temperance movement during the previous decades, by imposing a total ban on alcoholic beverages, known as the Prohibition. Alcoholic drinks could not be produced, distributed, sold or consumed anymore, because its detractors claimed that alcohold led to inmoral and violent attitutudes and that, on top, it was bad for human health.
This amendment was subsequently replaced by the 21st Amendment in 1933 and therefore, the Prohibition only functioned for 24 years.