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Archduke Francis Ferdinand heir to the Austria-Hungary throne and his wife are assassinated by a Serbian Nationalist in Sarejevo.
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Austria declared war on Serbia.
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Germany agrees to have a war with Russia.
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France, Russia, Italy and Britain conclude secret Treaty of London.
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Italy changed sides and declared war on Germany and Austria.
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The Battle of Verdun begins as the Germans launch a massive attack against Verdun in what will become the longest battle of the war.
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The Sinking of the Laconia. The Zimmermann Telegram is passed to the US by Britain, detailing alleged German proposal of an alliance with Mexico against the US.
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USA declare war on Germany.
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Germany crossed Somme's line and attacked it.
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Germany signed armistice with allies officially ending the war.