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France was beaten and Paris was attacked. This made Germany believe that France would be easily beaten in a war. This also angered France and made them want a war because they wanted to take "their" land back.
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French troops in Morocco led Germany to demand territorial compensation. This made Germany embarrassed, combative and aggressive.
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Military leaders in Russia and Serbia continue to fight over Scutari. This causes tension between the nations and makes it so war would start easily.
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Prussian leader, Liman headed a mission to take control of Constantinople. This gave Germany control of the Ottoman Empire, which the Russians opposed to.
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The last straw leading up to WWI was the assassination of Archduke Franz Ferdinand of Austria and his wife Sophie, Duchess of Hohenberg in Sarajevo
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Austria-Hungary sends an ultimatum to Serbia concerning the assassination of Archduke Franz Ferdinand and his wife. Serbia would have to let Austria-Hungary perform a full investigation of the assassination and Serbia would not be allowed to publicize Austrian propaganda.
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Serbia ignored Austria-Hungary's ultimatum so Austria-Hungary declares war as a result.
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Once Austria-Hungary declares war on Serbia, Britain tried to ease conflict by issuing an international mediation. Instead, Germany began to mobilize their troops. Russia urged Germany not to, and then began mobilizing their own troops just in case. Because of this, Germany began to mobilize their own troops.
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Russia was mobilizing their troops for war and Germany tried to get them to stop. When Russia did not listen, Germany then declared war on them and the Great War began.
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Germany declares war on Russia and because of this, France and Belgium begin full mobilization.