Modernism in American literature was fueled by domestic shifts like increased urbanization and new technologies as well as international events like World War 1 and the Great Depression. Poets like Emily Dickinson, Walt Whitman, Ezra Pound, and T.S. Eliot experimented with free verse and imagery to express modern life and disillusionment. Novelists like Ernest Hemingway, F. Scott Fitzgerald, and William Faulkner used techniques like stream of consciousness and multiple perspectives to realistically portray the post-war era. Overall, American modernist writers innovated forms and addressed contemporary issues through their literature.