The statement, "it has become popular on the radio and in speaking clubs and bars" explains the cultural influence of jazz in America in the 1920s.
Explanation:
The Jazz Age was a cultural era and revolution in America in the 1920s that contributed both to the emergence and development of new musical styles and dance. Jazz quickly spread to the White Middle Class in America, mostly due to African Americans with new musical innovations and contemporary African practices.
Flapper & Fashion: Hemlines rose and bodices fell during the 1920s. Bagged male pants and shortened women's hair. Jazz, together with much more, affected these trends
Jazz and Women's Liberation: In the 1920s, jazz music offered inspiration and a motivation for many women to push further than the traditional sex-role in the culture.
Bottom Music Increases: African American jazz music exploded across the world in the 1920s. Jazz music was able to attain recognition as a medium of African American culture. The ethos of a minority has become the appetite of the majority for the very first time in history.