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Archduke Francis Ferdinand is assassinated on a trip to Sarajevo with his wife
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After Serbia fails on the ultimatum set forth by Austria-Hungary, A-H declares war on Serbia
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After Austria-Hungary declare war on Serbia, Russia mobilizes to protect its ally
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Germany invades Belgium, a neutral country in the war. This causes WW1 to actually start
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A German U-boat sinks the passenger liner Lusitania, which carried 1,198 people with 128 Americans onboard
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Congress authorizes Wilson's declaration of war against Germany. The US joins the Allies
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Congress passed the Selective Service Act, which set up the draft
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Germany signs a peace treaty with the Bolshevik government of Russia. This allows Germany to move soldiers to the Western front
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An armistice was signed, which ended the fighting and the Great War