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The assassination of Archduke Ferdinand was the event that started a war within Europe. Soon almost every country had a side to pick. This war would later be known as The Great War.
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German U-boats start to attack Allied and neutral shipping. The Germans also decare a bockade of Britain.
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The British retaliate against German's blockades on their ports by declaring a blockade on German ports.
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First use of poison gas by Germany starts Second Battle of Ypres. The gasses ranged from things such as Tear and Mustard gases to lethal gasses such as Chlorine
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Battle of Jutland, the biggest naval battle in history, ultimately without a clear victor
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Start of the Battle of the Somme, with the greatest number of casualties in British military history, 60,000.
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First German airplane air-raid on Britain. One of the most famous people of these raids was Manfred von Richthofen, also known as the Red Baron, who had won at least 80 airial victories.
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With a revolution on his hands, Tzar Nicholas II leaves the war to handle its on problems.
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US President Woodrow Wilson's war cabinet votes unanimously in favour of declaring war on Germany. Soon after Woodrow Wilson delivers his war address to Congress.
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The end of World War One. Ended in a cease fire on this day. Later known as Armistice Day.