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Princip assasinated Archduke Franz Verdinand; this started World War 1.
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Started because of the assaaination of the Archduke
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Treaty Signed after WWI; harsh conditions
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Started because of the unfair conditions of the Treaty of Versailles, and Adolf Hitler, partly Japan also.
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Attack on Pearl Harbor by Japan; many casualties.
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2 Atomic Bombs were dropped on Hiroshima and Nagasaki, This ended World War 2.