What did the passage of the Eighteenth Amendment and the Volstead Act bring about?

These brought about the time known as Prohibition. Liquor was illegal. A subculture would grow out it. The rise of speakeasies, moonshiners, rum runners, and the mob. The time of the gangster would evolve as they would use the illegal businesses to funnel cash and make themselves rich. Men like Babyface, Al Capone, and John Dillenger would rise to both fame and infamy.