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His assassination in Sarajevo caused Austria/Hungary's declaration of war against Serbia. This caused Germany and Austria-Hungary, and countries allied with Serbia (the Triple Alliance Powers) to declare war on each other, starting World War I.
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After the assassination of Archduke Franz Ferdinand, Austria was believing that the Serbs were harboring the terrorists who had killed the archduke, Austria declared war on Siberia.
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Germany declared war on France and invaded Belgium. As a result of it's aliance with Belgium, Britain declares war on Germany.
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was a First World War battle fought for the town of Ypres in western Belgium
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There outraged protests from the United States at the German U-boat campaign was sank
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Poison gas was used for the first time during this battle.
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Italy entered the war on the side of the Allies.
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The United States of America declared war on Germany in response to the sinking, by German U boats, of US ships.
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the Russians signed an Armistice with Germany at Brest-Litovsk. Russia had to surrender Poland, the Ukraine and other regions. Germany had to pay 300 million roubles for the repatriation of Russian prisoners.
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The fighting ended with the signing of an armistice which went into effect at 11:00 a.m. It required the German forces to evacuate their positions and return to Germany, along with France and Austria