Answer:
Frederick Jackson Turner argued that overseas expansion was a "safety valve" to keep ambitious Americans content.
In general, World War II played a role in the eventual decolonization of Southeast Asia because the Japanese lost the war and were forced to give up many of their holdings.
Civilizations in the Americas and sub-Saharan Africa were isolated from Eurasia mostly because of oceans and large seas such as the Mediterranean.
Answer:
I'm guessing africa is the the continent
