The Jazz Age in the United States was in the 1920s when the influence of jazz music was widespread and society was experiencing prosperity, Prohibition and the beginnings of social change. (noun)
See Jazz Age in Webster's New World College Dictionary
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a period of U.S. history in the 1920s noted for general prosperity, financial speculation, Prohibition, the emergence of organized crime, profound social, cultural, and literary change, and the influence of jazz