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The assassination of Archduke Franz Ferdinand happened in Sarajevo, Bosnia. Gavrilo Princip was member of the Black Hand, an anarchist organization that looked for the end of Austro-Hungarian rule in Bosnia, assassinated him, sparking World War I.
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Austria-Hungary declared war on Serbia, after the assassination of the Archduke. This declaration of war increased tensions in Europe and was a key reason that led to the start of World War I.
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It was part of Germany´s military strategy in the First World War. It involved the German army, Belgian civilians and military forces. It is important because it violated Belgium's neutrality and provoke that more countries joined the conflict.
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This event involved the Italian army and the Austria-Hungary empire. It is significant because it changed the balance of power in the conflict and brought Italy into the war on the side of the allies after having been on the other side.
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The USA joined the fight in WWI by declaring war on Germany and joining the Allies. This decision, made by the government and military, had an enormous impact on the course of the war and led to Germany's defeat.
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The Bolsheviks stormed the Winter Palace in Petrograd during the October Revolution. They participated in it with Lenin and the provisional government. The change marked the end of the Russian Revolution and the beginning of Bolshevik control.
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It has its origins in the promise of Lenin´s party :"peace, land and bread". The Russians wanted the end of the war, that´s why Lenin was supported. The result of this, is the signing of the treaty of Brest-Litovsk.
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This treaty was signed in Brest-Litovsk (Nowadays Belarus), by Russia, the Republic of Ukraine and the Central Powers. After much pressure from Germany to reach a final agreement, it consisted of the USSR leaving WW1 and the loss of territories.
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This treaty is the one that ends WW1 and is considered partly responsible for WW2, for these two reasons: 1st it should not have been signed in Paris (it was not a neutral zone) and 2nd the sections created resentment in Germany.