Answer:
The factor that most contributed to the creation of new nations in the decades immediately following the Second World War was the process of decolonization. Many European colonial powers were weakened by the war and faced increasing pressure from anti-colonial movements in their colonies. The global shift towards self-determination and independence, as well as the United Nations' emphasis on human rights and equality, also played a role in accelerating the process of decolonization. Many former colonies in Asia, Africa, and the Middle East achieved independence in the decades following World War II, leading to the creation of numerous new nations. This process of decolonization had significant political, economic, and social consequences, both for the former colonies and for the rest of the world, as it reshaped the global power dynamics and led to the emergence of new nations on the world stage.