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Germany defeats Russia forcing them to retreat back into Russia. Many Russian soldiers were sent into combat without riffles.
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Once they joined Central Powers they cut off crucial Allied supply lines to Russia through the Dardanelles, a vital strait connecting the Black Sea and the Mediterranean.
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Ottoman Empire signs an accord with Germany and enters the war.
https://www3.dbu.edu/mitchell/ww!keyevents.htm -
Germany began using poison gas as a weapon. Allies soon followed.
http://www.historylearningsite.co.uk/world-war-one/the-western-front-in-world-war-one/poison-gas-and-world-war-one/ -
Allies sent a massive force of British, Indian,, Australian, and New Zealander troops to try to open the strait. After 10 months and 200,000 deaths Allies finally with drew troops.
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Russians retreat from German-Austrian offense.
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Germany got desperate to break the stalemate so they announced that they would resume unrestricted submarine warfare.
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British intercepted a message from the German foreign minister, Arthur Zimmermann that stated that Germany would help Mexico to "reconquer lost territory in New Mexico, Texas and Arizona". This made the hatred for Germany grow rapidly in America.
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The March Revolution forced Tsar Nicholas to abdicate. The Duma set up a provisional government.
http://www.history.com/topics/russian-revolution -
Congress approved declaring war on Germany because it was a "war to end war". America had many allies with countries involved in the war so this was to "make the world safe for democracy".
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Lenin signed the Treaty of Brest-Litovsk to end Russia's participation in the war.
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A Civil War starts between the Reds (Bolsheviks) and the Whites. The Reds execute the tsar and his family.
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Germany finally came to an agreement with Allies at 11 A.M. causing the Great War to come to end.
