These are books and plays, most of which were published in the 1920s, that are discussed in Chapter 9 of "From Puritanism to Postmodernism: A History of American Literature". Chapter 9 is within the section "Modernism in the American Grain".
This is the 3rd instalment of a maximum of eleven, depending on the level of interest shown (aka if Tommood keeps doing them). The instalments are being published in more or less reverse chronological order. Second challenge at the link.