Flapper Americana Novissima
The term flapper appears to have made its American debut in the February 1915 issue of the New York–based satire/arts review, The Smart Set: A Magazine of Cleverness. In an article in the review, author Henry L. Mencken introduced the word, which seems to have already been in use over in Britain to describe a certain type of young woman. In the United States, up until that time, the French word ingénue was invariably employed.