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The Russian Revolution removed Russia from the war and transformed the Russian Empire into the Union of Soviet Socialist Republics. The significance is Russia overthrew the imperial government.

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The First Battle of the Marne succeeded in pushing the Germans back for a distance of 75 miles and enabled the French to continue the war. The significance marked the end of the German sweep into France and the beginning of the trench warfare.

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The Lusitania was a British passenger ship that was sunk by a German U-Boat. It caused international outrage and helped turn public opinion against Germany.

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Helped draw the United States into war. And then helped end with an armistice, an agreement in which both sides agree to stop fighting.

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When America entered the war Woodrow Wilson declared war on Germany it helped turn the tide in favor of Britain and France. The United States had remained neutral. The declaration of war was a response to the submarine war that Germany had done.

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Wilson outlined his vision for a stable, long-lasting peace in Europe. A blueprint for world peace that was to be used for peace negotiations after World War I.

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An armistice was signed between the Germans and the Allies. The Germans evacuated occupied territory in France and Belgium. Which then the armistice brought an end to the fighting on the Western Front.

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The Treaty of Versailles ended World War 1. A loss of territories, military forces, and reparation payments to Allied powers. It banned Germany from having an army, which forced them to pay $33 billion to Allies in reparations. Then war-guilt clause Germany accepts full blame for the war.

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When Franz Ferdinand was assassinated it led Austria-Hungary to declare war on Serbia. Serbia refused to meet all ten demands. Austria declared war on Serbia. The fight devastated Europe and ended the Austro-Hungarian empire, marking the beginning of World War 1.

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The assassination of Franz Ferdinand led to the outbreak of World War 1. Austria-Hungary held Serbia responsible for the assassination. Which then Austria-Hungary immediately blamed the Serbian government for the attack.