The United States is a multi-ethnic country. Immigrants keep pouring in, each bringing its own culture, which determines the diversity and complexity of American literary style. The development of American literature is a process of constantly absorbing and integrating the characteristics of national literature.
Many American writers come from the lower class, which makes American literature have a strong flavor of life and civilian color, and its overall feature is cheerful and bold. The complexity of content and bright colors are another feature of American literature. Freedom of personality and self-restraint, Puritanism and pragmatism, radicalism and reactivity, rebellion and obedience, elegance and vulgarity, elegance and vulgarity, profundity and shallowness, enterprising and cynicism, brightness and obscurity, sharp irony and gloomy humor, meticulous carving and rough production, thinking and exploration of human destiny and morbid pursuit of sex can not only coexist, but also form a strong contrast. There has never been a trend or tendency to unify the world of American literary circles in a period of time.
American writers are sensitive and curious, and often one wave does not fall, and another wave rises again and changes with each passing day. Writers are always in the process of exploration and experiment. Since the 20th century, many literary trends of thought have originated in the United States, which have brought positive and negative influences to world literature.