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Germany declared war against Russia
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The French dug out miles of parallel trenches to protect troops and equipment.
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Woodrow Wilson kept the States Neutral to be reelected and to keep Americans safe.
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A German submarine knocked out a British passenger boat, the Lusitania, and it killed 120 Americans on that ship.
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Serbia was trying to delay the transport of military equipment going from the Austria-Hungarians to the Russians.
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During WWI, Russia was going through their a revolution which didn't help with their situation in the war.