Ernest Hemingway in World War I uniform. At the beginning of the 20th century, American novelists were expanding fiction's social spectrum to encompass both high and low life and sometimes connected to the naturalist school of realism. In her stories and novels, Edith Wharton (1862–1937) scrutinized the upper-class, Eastern-seaboard society in which she had grown up. One of her finest books, The Age of Innocence, centers on a man who chooses to marry a conventional, socially acceptable woman rather than a fascinating outsider. At about the same time, Stephen Crane (1871–1900), best known for his Civil War novel The Red Badge of Courage, depicted the life of New York City prostitutes in Maggie: A Girl of the Streets. And in Sister Carrie, Theodore Dreiser (1871–1945) portrayed a country girl who moves to Chicago and becomes a kept woman. Hamlin Garland and Frank Norris wrote about the problems of American farmers and other social issues from a naturalist perspective.
More directly political writings discussed social issues and power of corporations. Some like Edward Bellamy in Looking Backward outlined other possible political and social frameworks. Upton Sinclair, most famous for his meat-packing novel The Jungle, advocated socialism. Other political writers of the period included Edwin Markham, William Vaughn Moody. Journalistic critics, including Ida M. Tarbell and Lincoln Steffens were labelled the The Muckrakers. Henry Adams' literate autobiography, The Education of Henry Adams also depicted a stinging description of the education system and modern life.
Experimentation in style and form soon joined the new freedom in subject matter. In 1909, Gertrude Stein (1874–1946), by then an expatriate in Paris, published Three Lives, an innovative work of fiction influenced by her familiarity with cubism, jazz, and other movements in contemporary art and music. Stein labelled a group of American literary notables who lived in Paris in the 1920s and 1930s as the «Lost Generation».
The poet Ezra Pound (1885–1972) was born in Idaho but spent much of his adult life in Europe. His work is complex, sometimes obscure, with multiple references to other art forms and to a vast range of literature, both Western and Eastern. He influenced many other poets, notably T.S. Eliot (1888–1965), another expatriate. Eliot wrote spare, cerebral poetry, carried by a dense structure of symbols. In «The Waste Land» he embodied a jaundiced vision of post-World War I society in fragmented, haunted images. Like Pound's, Eliot's poetry could be highly allusive, and some editions of The Waste Land come with footnotes supplied by the poet. In 1948, Eliot won the Nobel Prize in Literature.
American writers also expressed the disillusionment following upon the war. The stories and novels of F. Scott Fitzgerald (1896–1940) capture the restless, pleasure-hungry, defiant mood of the 1920s. Fitzgerald's characteristic theme, expressed poignantly in The Great Gatsby, is the tendency of youth's golden dreams to dissolve in failure and disappointment. Sinclair Lewis and Sherwood Anderson also wrote novels with critical depictions of American life. John Dos Passos wrote about the war and also the U.S.A. trilogy which extended into the Depression. Ernest Hemingway (1899–1961) saw violence and death first-hand as an ambulance driver in World War I, and the carnage persuaded him that abstract language was mostly empty and misleading. He cut out unnecessary words from his writing, simplified the sentence structure, and concentrated on concrete objects and actions. He adhered to a moral code that emphasized grace under pressure, and his protagonists were strong, silent men who often dealt awkwardly with women. The Sun Also Rises and A Farewell to Arms are generally considered his best novels; in 1954, he won the Nobel Prize in Literature.
Five years before Hemingway, another American novelist had won the Nobel Prize: William Faulkner (1897–1962). Faulkner managed to encompass an enormous range of humanity in Yoknapatawpha County, a Mississippian region of his own invention. He recorded his characters' seemingly unedited ramblings in order to represent their inner states, a technique called «stream of consciousness.» (In fact, these passages are carefully crafted, and their seemingly chaotic structure conceals multiple layers of meaning.) He also jumbled time sequences to show how the past – especially the slave-holding era of the Deep South – endures in the present. Among his great works are The Sound and the Fury, Absalom, Absalom!, Go Down, Moses, and The Unvanquished.
Depression era literature was blunt and direct in its social criticism. John Steinbeck (1902–1968) was born in Salinas, California, where he set many of his stories. His style was simple and evocative, winning him the favor of the readers but not of the critics. Steinbeck often wrote about poor, working-class people and their struggle to lead a decent and honest life; he was probably the most socially aware writer of his period. The Grapes of Wrath, considered his masterpiece, is a strong, socially-oriented novel that tells the story of the Joads, a poor family from Oklahoma and their journey to California in search of a better life. Other popular novels include Tortilla Flat, Of Mice and Men, Cannery Row, and East of Eden. He was awarded the Nobel Prize in Literature in 1962. Other writers sometimes considered part of the proletarian school include Nathanael West, Fielding Burke, Jack Conroy, Tom Kromer, Robert Cantwell, Albert Halper, and Edward Anderson.