What is the difference between "European and American literature" and "comparative literature"?

European and American literature is a geographical concept, referring to the literature of Europe and the United States. Comparative literature is the study of the influence of literature between countries, such as transmission, evolution and so on. By definition, it is not limited to European and American literature. Nowadays, comparative literature also studies some ****same problems of literature, which, at this point, is somewhat similar to literature and art, but the method of study is different. In the West, the research boom of comparative literature has receded, many researchers of comparative literature to engage in cultural studies.