Origin of the term: The phrase is attributed to Gertrude stein , then popularized by Ernest Hemingway in the epigraph to his novel “the sun also rises” and his memoir “a moveable feastVariously, the term is used for the period from the end of World War I to the beginning of the Great Depression , though in the United States it is used for the generation of young people who came of age during and shortly after World War I, alternatively known as the World War I Generation. Broadly it is often  ...