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The Archduke and Archdutches were assinated by Serbian Nationalists. It started WWI.
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It was the start of marine wars.
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This was a truce on the eve of christmas so that everyone didn't fight just for christmas.
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Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets.
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Tsar was the last emperor of Russia and he takes all control of the whole Russian army.
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The Battle of Verdun was the longest battle of World War I and was one of the bloodiest.
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The major naval battle of the war, begins.
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This means that he renounces his throne or he fails to fufill or undertake a resonsabilty or duty.
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Which is a peace treaty between new Bolshevik and central powers.
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WWI ends offical