Final answer:
Prohibition in Canada led to the rise of organized crime, the creation of speakeasies, and an increase in violence and crime, ultimately contributing to the repeal of the law.
Step-by-step explanation:
One unanticipated consequence of Prohibition in Canada between 1921 and 1929 was the significant growth of organized crime and the rise of infamous gangsters, such as Al Capone, who capitalized on the persistent demand for alcohol. Prohibition led to the creation of illegal bars known as speakeasies, with cities like Detroit becoming hotspots for smuggled liquor. This illegal trade made enforcement difficult, increased violence and crime, and ultimately contributed to the repeal of Prohibition in 1933.