Decolonization refers to the process by which colonized territories gained independence from imperial rule. There are two main definitions - one views it as territories legally becoming independent sovereign states, while the other sees it as reversing the impacts of European imperialism on political, economic, social and cultural aspects. Decolonization occurred as colonized peoples thirsted for freedom, World War II weakened colonial powers' perceived invulnerability, and anti-colonialism grew internationally through organizations like the United Nations. Scholars like Tony Chafer, Martin Shipway, and Martin Thomas have contributed to the study of decolonization.