American literature from 1860 to the present reflects the nation's rapid transformation through industrialization, urbanization, and technological advancements. Writers grappled with societal changes, exploring themes of identity, alienation, and the American Dream in increasingly experimental styles. Literary movements like Realism, Naturalism, Modernism, and Postmodernism emerged in response to cultural shifts. Authors like Twain, Hemingway, and Faulkner captured the evolving American experience, while the Harlem Renaissance celebrated African American culture and identity.