How did the Jazz Age a moniker Fitzgerald coined provide climate favorable to his work?

The provided prompt contains inaccurate claim: F Scott Fitzgerald's never coined term ''Jazz Age'', the popular phrase is credited to social critics Mark Van Doren, who used to term in an essay published May 1922 by The Nation and to critic and novelist F. L. Allen's in his 1931 book on the 1920s entitled ''Only Yesterday: An Informal History of the Nineteen-twenties''.