Rum Running and the Roaring Twenties: Prohibition on the Michigan-Ontario WaterwayOn January 17, 1920, the Eighteenth Amendment took effect in the United States, prohibiting the manufacture, sale, use, or importation of alcoholic beverages except for scientific and medicinal purposes. Church and business leaders, temperance advocates, and state and national officials predicted that a tranquil new era was about to begin an era when prisons would be empty, police forces could be drastically cut, and workers would be more productive,