The document discusses several topics related to changes in American society in the 1920s including:
1) The rise of mass production techniques and new technologies led to better factory machinery, higher production, higher wages, and increased demand for consumer goods which further drove mass production.
2) Sports as entertainment was introduced and had an effect on American popular culture.
3) Various musical styles emerged including jazz, blues, folk sounds and ballads, country and western, and hillbilly music which were influenced by African American and rural southern white musical roots.