The correct response to describe the impact of decolonization worldwide after World War II is:
In the decades after World War II, many empires granted independence to their former global colonies. This caused the birth of new countries worldwide. This process occurred peacefully in some places and violently in many places.
This statement accurately reflects the broad and varied nature of decolonization, including the emergence of new nations and the different pathways to independence, which included both peaceful negotiations and violent struggles.