Postcolonial literature is the literature by people from formerly colonized countries. It exists on all continents except Antarctica. Postcolonial literature often addresses the problems and consequences of the decolonization of a country, especially questions relating to the political and cultural independence of formerly subjugated people, and themes such as racialism and colonialism. A range of literary theory has evolved around the subject. It addresses the role of literature in perpetuating and challenging what postcolonial critic Edward Said refers to as cultural imperialism.