The document discusses modernism (1914-1945) as a diverse movement that challenged traditional art forms and realism through techniques like stream of consciousness and fragmented narratives. Key figures include Gertrude Stein, Ezra Pound, T.S. Eliot, William Faulkner, and Ernest Hemingway, each representing unique aspects of modernist writing and themes of disillusionment. The period is marked by the 'lost generation', a response to the aftermath of World War I and societal changes, leading to a re-examination of American literature and culture.