Prohibition aimed to reduce drinking by eliminating businesses that produced and sold alcohol. The prohibition movement gained strength in the late 19th century through organizations like the Anti-Saloon League. By the early 20th century, prohibition supporters successfully enacted local and eventually national prohibition laws. During prohibition, alcohol consumption dropped to 30% of pre-prohibition levels but illegal supplies grew in the later years as younger generations rejected prohibition. It took many years after repeal for drinking to return to pre-prohibition levels, showing prohibition was initially effective at reducing alcohol consumption.