This document is a paper submitted by Hariyani Kishan.R to S.B.G Department of English at M.K.Bhavnagar University in batch 2015-2017. It discusses the evolution of English studies, the incorporation of American literature, and the differences between Commonwealth literature and postcolonial literature. Commonwealth literature highlights similarities between English-language literatures, but does not account for literature from non-Commonwealth countries or exclude British literature. Postcolonial literature relates literatures based on a shared history of colonialism and includes criticism of both Western and non-Western texts.