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The Serbian nationalist group known as the "Black Hand" assassinates Archduke Franz Ferdinand and hif wife Sophie in Sarajevo.
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Austria-Hungary declares war on Serbia, with the backing of German allies, for the assassination of their Archduke.
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Trench warfare is spawned as both sides dig trenches for their troops.
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The U.K. blocks German supplies from getting in and out of the North Sea.
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Germany announces that the waters around the United Kingdom will be a war zone, thus putting up a submarine blockade where everything was not allied with them was to be shot.
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These campaigns were almost purely to disrupt the Ottoman Empire's shipping routes.
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The new German posion gas is first used here, to great effect and losses to the opposing forces.
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This is considered one of the greatest Ottoman victories throughout the war.
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The Lusitania is sunk by a German U-boat, killing 128 Americans and quickening their descent into the war.
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The longest and bloodiest battle of the entire war begins, causing great losses to German troops.
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The greatest naval battle of the war begins, both sides claimed victory, even though the British lost more ships and twice as many casualties.
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The Battle of the Somme begins, and the prototype tank is introduced, used for getting over enemy trenches and barbed wire.
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The "Zimmermann Telegram" is sent from Germany to Mexico, but is interfered by the British. The telegram attempts to get Mexico to invade the U.S.
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Russian riots and rebellions had gotten too out of hand, so Tsar Nicholas II ends his reign,
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Due to the material in the "Zimmermann Telegram" the U.S. decides to declare war on Germany, thus joining the war.
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The new Russian government makes an agreement with the Central powers to be out of the war.
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He calls for postwar peace throughout Europe, due to him believing that this is a moral fight.
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Russia signs a peace treaty with the Central Powers.
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Germany makes a series attacks along the Western Front, making some of the largest advances in the area since 1914.
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The German defeat here started the great increase in the Allies advances.
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Welhelm II was forced to abdicate and flee to Holland due to rebellion spreading to Berlin.
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The war is ended at the eleventh hour, on the eleventh day, during the eleventh month.
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The signing of this treaty marks the official end of the First World War.
