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Archduke Franz Ferdinand of Austro-Hungary was assassinated by Gavrilo Princip, who was part of a Serbian government-backed nationalist group.
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All countries involved except the U.S. have joined by this date.
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First trench warfare
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The blockade of Germany begins.
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The longest battle of the war begins.
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The only full-scale naval battle of the war happens.
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The first tanks are introduced on the battlefield.
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The Bolsheviks overthrow their government.
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A ceasefire is held and ends the war.
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