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The Archduke was assassinated by Serbian nationalists who wished to make Bosnia a part of a new Slav state. His death provoked Austria-Hungary to declare war on Serbia.
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This was the beginning of the first world war.
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Britain promised to protect Belgium so when Germany attacked France through Belgium, they declared war.
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The French and British were victorious over the Germans who had outrun their logistics and artillery early in their battle.
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The Americans were angered by attacks upon ships in the Atlantic.
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Led by Vladimir Lenin, a group of Bolsheviks overthrew the Russian tsar and exited the war in order to focus on building a communist state.
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Established during creation of Treaty of Versailles to prevent more world wars.
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Hitler blamed the jews for causing the Germans to lose in WW1. He saw them as inferior and made plans to persecute them.
