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| 1917 March 1 |
| | | The Petrograd Soviet demands drastic reforms in return for supporting the proposed Provisional Government in Russia | |
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| 1917 March 15 |
| | | Prince Georgi Lvov becomes prime minister in Russia's new Provisional Government | |
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| 1917 April |
| | | The German authorities allow Lenin to travel home from Switzerland through Germany, hoping for Communist disruption of the Russian war effort | |
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| 1917 April |
| | | Lenin expounds in Petrograd the new theory of his April Theses, predicting the possibility of imminent revolution | |
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| 1917 April 6 |
| | | Woodrow Wilson, president of the USA, declares war on Germany | |
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| 1917 April |
| | | Trotsky hurries back to Russia from exile in the United States | |
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| 1917 April |
| | | German U-boats sink 430 Allied and neutral merchant ships in this month alone | |
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| 1917 April 12 |
| | | Canadian troops take Vimy Ridge, subsequently the site of Canada's most important war memorial | |
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| 1917 June |
| | | The Allies frustrate the German U-boats by introducing the convoy system | |
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| 1917 June |
| | | A Russian summer offensive against the Germans results in massive loss of life and territory | |
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