What is the main idea of post-colonialism?

Post-colonialism is the study of the legacies of colonialism and imperialism, often explored in literature and the arts. The "main idea" of post-colonialism is to study the cultural shifts that occurred in the context of colonialism or imperialism. Such studies may be concerned with the blended nature of colonial cultures or seek to compare the different lived experiences — like that of the colonizer versus the colonized — in the context of colonialism or imperialism. Post-colonialist studies have a lot of overlap with other areas of cultural study like gender, class, religion, race, and ethnicity. Much of post-colonialist literature challenges the assumed hegemony or dominant culture of the colonial period. For example, post-colonialist literature written on the era of European colonization in Haiti may contrast the lived experiences of enslaved and free people of color with the experiences of the white ruling class. In sum, post-colonialism re-examines the realities of colonialism.