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Archduke Franz Ferdinand, heir to Austria-Hungary's throne, and his wife, Sophie, are assassinated by a Serbian nationalist while the couple were visiting Sarajevo, Bosnia.
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Ausria-Hungary declares war on Serbia after the assasination of the Archduke.
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Germany declares war on Russia and France.
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The United Kingdom declares war on Germany, after Germany invades Belgium.
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U.S. President Woodrow Willson announces that the U.S. will remain neutral.
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The first use of trench warfare begins during the first battle of Marne.
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The United Kingdom announces that the North Sea is a military area, effectively creating a blockade of goods into Germany.
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It is during the second battle of Ypres that the Germans first use poison gas.
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Nicholas II takes full control if the Russian army.
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Many royalist warned Nicholas II about a potential revolution was imminent, but even after hearing this warning over and over, Tsar Nicholas II decide to ignore the potential threat.
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Many people carried revolts accross the cold regions of Russia. The people started rasing red flags and starting chanting "Down with the war! Down with the Tsar!" The cabinet members pleaded to Nicholas to return to the capital and to resign.
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The Bolsheviks successfully overthrow the Russian government during the revoltution and the war.
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Tsar Nicholas II signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers.
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Tsar Nicholas II was executed by revolutionaries during the Russian Revolution and was the main reason the Russian army withdrawn from the war.
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The Treaty of Versailles officially ends World War I.
