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Archduke Franz Ferdinand, the heir to the Austrian throne, along with his wife, is assasinated by Gavrilo Princip in Sarajevo.
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Austria-Hungary declares war on Serbia. Germany declares war on Russia and France. The UK declares war on Germany after they invade Belgium. Austria-Hungary declares war on Russia and Serbia declares war on Germany.
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Trench warfare also begins as soldiers on both sides dig them. This battle was fought by France and the United Kingdom against the German empire in Marne, France. It was a victory for the Allies.
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This battle was fought by the Ottoman Empire against the British and the French over the penninsula at Gallipoli.
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A British ocean liner, the RMS Lusitania, is sunk by a German U-boat.
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Germany sends the secret Zimmerman telegram to Mexico, asking for their help in the war. The British intercept and decipher it.
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U.S. declares war after the U.K, informs them of the Zimmerman telegram and the letter Germany had sent to Mexico, asking them for their help in the war.
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President Woodrow Wilson issues the Fourteen Points which called for freedom of the seas, free trade, end to secret traties, reduction of arms, and lasting peace.
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The leader of Germany, Kaiser Wilhelm II abdicates and flees Germany, going to the Netherlands.
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Germany signs the armistice in Compiegne, France, which ends fighting on November 11th at 11 AM.
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The Treaty of Versailles officially ends World War I.
