Prohibition in United States history was a nationwide constitutional ban on the sale, production, importation, and transportation of alcoholic beverages that remained in place from 1920 to 1933. It was promoted by the "dry" crusaders, a movement led by rural Protestants and social Progressives in the Democratic and Republican parties, and was coordinated by the Anti-Saloon League, and the Woman's Christian Temperance Union. Prohibition was mandated under the 18th Amendment to the United States Constitution. The Volstead Act clarified which types of alcohol were permitted or prohibited. For example, religious uses of wine were allowed. Private ownership and consumption of alcohol were not made illegal under federal law; however, in many areas, local laws were stricter, with some states banning possession outright. Nationwide, Prohibition ended with the ratification of the 21st Amendment, which repealed the 18th Amendment, on December 5, 1933.
Prohibition succeeded in cutting overall alcohol consumption in half during the 1920s, and consumption remained below pre-Prohibition levels until the 1940s. However, it led to unintended consequences such as the growth of urban crime organizations, epitomized by Al Capone. As an experiment it lost supporters every year, and lost tax revenue that governments needed when the Great Depression began in 1929.
Sam Yeager told Straha that Prohibition's failure set a precedent for the future of the war on ginger. He speculated that The Race might one day see they were fighting a losing battle, and legalize ginger in their territories. Straha, himself a ginger user in the USA where the herb was legal, replied that this was unlikely. Ginger was more dangerous to the Race than alcohol was to Tosevites, and its continued illegality was a necessary measure.