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Archduke Ferdinand was assassinated by Gavrilo Princip. Austria-Hungary blamed Serbia.
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The Germans fire shells of gas at the Allied forces. This is the first time gas was used in WW1.
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Germans sink the ship Lusitania. It was carrying over 100 Americans.
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British brings the first tanks ever in battle. Help soldiers cross no mans land safer.
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Germany begins unrestricted warfare with submarines again. This brings the U.S. closer to war.
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Note from Germany to Mexico asking for Mexico to declare war on America. Greatly enrages the U.S.
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U.S. joins the war. This gave the Allies a great advantage.
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The Selective Service Act made the draft. This allowed us to get many troops for our cause.
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Germans sign a treaty with Russia. This gave land to Germany.
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World War 1 comes to an end with Germany signing the armistice. The war lasted four years.
