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Assassination of Archduke Franz Ferdinand and his wife.

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Austria-Hungary declares war on Serbia.

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Germany declares war on Russian and France.

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Britain declares war on Germany.

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Beginning of the Allies’ Gallipoli Campaign against the Ottoman Empire.

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German U-boat sank the Lusitania,a British ship,killing more than a thousand passengers,including Americans.

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Italy declares war on Austria-Hungary.

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Battle of Verdun.

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Battle of Jutland.

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Brusilov Offensive.

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Battle of the Somme.

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The United States declares war on Germany.

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Third Ypres Campaign.

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Russia signed armistice with Germany.

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Us President Wilson presented his Fourteen Points to the Congress.

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Treaty of Brest Litovsk between Russia and Germany.

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Beginning of the German Spring Offensive.

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Germany signed the arimistice.

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Paris Peace Conference.

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Signing of the Treaty of Versailles.