The NYTimes has an interesting review of a book on the beginning of Prohibition. How does prohibition of alcohol fit in with the rest of the 1920s ? Here's a short paragraph from the NYTimes review which I think you might find interesting since it places the 18th Amendment in the context of the conflict of cultures of the 1920s :

• "The 18th Amendment was a rarity in that it limited the rights of the individual rather than the activities of the government, thereby guaranteeing a hostile reception. As such, it holds the distinction of being the only constitutional amendment ever to be repealed. Which leads one to ask: How did this happen in the first place? Why would Americans curtail their precious right to drink?
• “Last Call,” by Daniel Okrent, provides the sobering answers. Okrent, the author of four previous books and the first public editor of The New York Times, views Prohibition as one skirmish in a larger war waged by small-town white Protestants who felt besieged by the forces of change then sweeping their nation — a theory first proposed by the historian Richard Hofstadter more than five decades ago. Though much has been written about Prohibition since then, Okrent offers a remarkably original account, showing how its proponents combined the nativist fears of many Americans with legitimate concerns about the evils of alcohol to mold a movement powerful enough to amend the United States Constitution."