The 1920's was a time of sensational economic growth and progress. Mass produced goods such as clothing, radios and cars were in abundance. The stock market boomed and most Americans benefited. But there was also economic inequality, thus the prosperity of the 1920's was unsustainable.
This counts as rhythm, the poet uses this to embed this into you mind and also to prove is point. But also there is a meaning to it as well.
Good morning! Have A nice day too!