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Arch-Duke Franz Ferdinand was killed by Gavrilo Princep. This is what caused the first World War.
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Austria-Hungry declared war on Serbia. Several other wars followed the next week
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Germany ivaded Belgium which sparked the beginning of WWI
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A German submarine sinks the Lusitania. The ship carried 1,198 people, 128 of them Americans. This is what made the Americans get involved.
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The British were the first ever to use a tank in battle, at Delville Wood.
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The British gave President Wilson the Zimmermann Telegram, a message from German stating that if Mexico sided with Germany in the war they would recieve Texas, Arizona, and New Mexico.
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The US declares war against Germany. The United States enters World War I on the side of France and Britain.
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The Selective Service Act required all men ages 18 to 45 were required to register for military service.
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Russia signed an armistice with Germany, ending the fighting on the Eastern Front
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Germany signed an armistice ending World War I.