Why do we study American literature? I mean, what can be learned from its study?

Why study
American literature? The question is not about literature but rather about the American aspect. 
Studying American literature encompasses understanding society.  From this study, society can
only improve by analyzing the writing in any culture.   American literature has produced some of
the most significant prose and poetry the world has seen. By analyzing the technical aspects of
famous American poetry, essays, short stories, dramas, and novels, the reader can learn how to
improve the future of American literature.  

American literature begins with
British literature.  The...