Why did Ernest Hemingway call Adventures of Huckleberry Finn important to modern American literature?

In his 1935 work Green Hills of Africa, Ernest Hemingway famously declared, "All modern American literature comes from one book by Mark Twain called Huckleberry Finn."1

While Hemingway’s statement is considered somewhat grandiose and obscure, it highlights his belief that Twain’s achievement in the novel was primarily aesthetic. By utilizing the artless, vernacular speech of its narrator, Huckleberry Finn, Twain moved away from the formal, genteel traditions of 19th-century writing. This approach allowed for a deeply felt, realistic portrayal of boyhood and the American landscape, grounded in the authentic use of dialect.12

For Hemingway, who was himself renowned for a succinct, lucid prose style that stripped away sentimentality and verbosity, Twain’s work represented a foundational shift toward a more direct and honest American voice. By capturing the rhythm and reality of spoken language, Twain provided a template that influenced the trajectory of modern fiction.134