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Archduke Ferdinand was shot down by Gavrilo Princip, one of the six assassins coordinated by Danilo Ilić.
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Enraged by Archduke Ferdinand's death, Austria-Hungary delcared war on Serbia.
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Russia had been threatening with already moving troops, and their put Germany in danger, making Germany take lead into declaring war.
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Germany, planning on doing a strategy created by a former chief of staff, declared war on France.
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Britain, led by Prime Minister Herbert Asquith, had given Germany an ultimatum to get out of Belgium by midnight of August 3rd. Instead Germany continued with their invasion.
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German government sent an ultimatum to Belgium, demanding passage through the country and German forces invaded Luxembourg.
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War was declared between Russia & Austria-Hungary because Russia had a treaty to protect Serbia & the assasination of Archduke Ferdinand had been blamed on Serbia, causing Austria to declare war on Serbia.
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Germany had declared war on Serbia's French allies, causing Serbia to declare war back at Germany.
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Germany had advanced into France, causing the war to break out .
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The German and western allies attempt to secure the town of Ypres in Belgium, causing war to break out.
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As RMS Lustinania first sets sail, Germany delcares the land around Great Britian a war zone, causing the US to send out newspapers suggesting not to get on the ship.
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On the afternoon of 7 May, Lusitania was torpedoed by a German U-Boat off the southern coast of Ireland.
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The Zimmermann Telegram was a diplomatic proposal from the German Empire for Mexico to join the Central Powers, which is also the action that caused the U.S. into declaring war on Germany.
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The incident that caused the U.S. to finally declare war was the Zimmerman Telegram, but the U.S. had already been aggrivated by Germany's agressive behavior.
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Soviet government issued a decree of peace, insisting that all belligerent powers open immediate negotiations for a democratic peace without annexations, and guarantee the right of every nation to self-determination.
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Russia's Bolshevik Revolution took place as forces led by Vladimir Ilyich Lenin overthrew the provisional government of Alexander Kerensky. The provisional government came to power after the February Revolution resulted in the Russian monarchy being overthrown.
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The Fourteen Points, a set of 14 principles proposed by President Woodrow Wilson as a basis for ending World War I and for keeping the peace thereafter.
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The armistice between the Allies and Germany – also known as the "Armistice of Compiègne" after the location it was signed – was the agreement that ended the fighting in western Europe that comprised the First World War.
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Although the armistice, signed on 11 November 1918, ended the actual fighting, it took six months of negotiations at the Paris Peace Conference to conclude the peace treaty.