America Began Alcohol Prohibition in 1919 but It’s Edging Toward Ending Cannabis Prohibition in 2019 Posted byAri Hoffnung January 10, 2019 Leave a comment on America Began Alcohol Prohibition in 1919 but It’s Edging Toward Ending Cannabis Prohibition in 2019 A century after the 18th Amendment prohibited alcohol the nation seems ready to finally let adults make their own choices about cannabis.