The 1920s also produced the greatest writer of theatre plays in American
history, Eugene O'Neill.
O'Neill was an Irish-American with a dark and violent view of human nature. His plays used new theatrical methods and ways of presenting ideas. But they carried an emotional power never before seen in the American theatre. Some of his best- known plays were Mourning Becomes Electra, The Iceman Cometh and A Long Day's Journey into Night.