<span>The answer is B. the assassination of Archduke Franz Ferdinand in Sarajevo
Powder keg in general term is a barrel of gunpowder but it is also used figuratively to refer to the way a small event sets off something much larger. Europe already had many small conflicts but in this event Archduke Franz Ferdinand was a heir to the austrian empire so as he was killed by Sarajevo who was Serbian Austria declared war on Serbia. Serbia was an ally of Russia.So Russia declared war on Austria-Hungary, then Triple Alliance and Triple Entente kicked in, bringing the entire continent to war.</span>
The answer is competition
After the II war, the African Nationalism emerged late 1940s and early 1950s because three main reasons: The first one was that nearly two million African soldiers who were part of the II war (1939-1945) were discontent after coming back to the colonial states to be treated as slaves. The second reason was that Kwame Nkrumah father of the Pan Africanism, influenced the African Nationalist leaders against the colonial rules to reach freedom and finally the third reason was to maintain the unity among them after the rejection of colonies which oppressed African Nationalist.
I think it is mesopotamia
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