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World War II
Problems left unsolved in WW1 caused WW2.
The resultant geographic change after World War 1 caused economic degradation for some countries and growth for others. Countries like Germany that lost many large territories and colonies lost important sources of raw materials for their industries.
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Einsteinium is not so important to change the world.
It was the assasination of archduke franz Ferdinand that directly started world war 1
Pearl Harbor is what had caused World War II, I believe that's the most important thing.
Apollo is one of the few Greek Gods not to have his name Romanised following the conquering of Greece by Roman forces. As Apollo's oracle at Delphi was one of the most important in the Ancient world to change it would have caused.
The attack on Pearl Harbor will be important to the world because it marked the point of World War II where America became part of the war. It brought America into the war, and caused them to bomb Hiroshima and Nagasaki in return.
Cleopatra had a great impact on the world of her time. She was the catalyst that caused the final civil war which brought Octavian to power and the change in the Roman government.
Caused a lot of wars, destroyed many people's indigenous religions, did a lot of charitable works.
the pearl harbor bombing by the Japanese