Washington irving's time was earlier than Mark Twain's, and he gradually separated American literature from the influence of English literary tradition, and the United States began to have its own literature. Before that, American literature had been imitating English literature and was greatly influenced by English literature. Owen described the natural scenery and customs of the United States. His works, including Sleepy Valley Legend and Rip's Dream, are all about American life. Mark Twain's style is mainly satire and humor, sympathy for the lower class and the oppressed. It also denies the disadvantages of the development of civilization.