The large increase in the number of separate countries in the world since World War II has been influenced most seriously by:

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Decolonization refers to the process by which the European colonial empires in Africa, Asia, and the Middle East gradually granted independence to their former colonies. This process led to the creation of many new countries in the post-World War II era, as newly independent nations emerged from the former colonial territories. Therefore, the large increase in the number of separate countries in the world since World War II has been influenced most seriously by decolonization.

The Large Increase in the Number of Separate Countries in the World