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The assassination of Archduke Franz Ferdinand, heir to the Austro-Hungarian throne started World War 1.
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The events of July and August in 1914was known as "one thing led to another" or also known as the treaty alliance system.
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Germany's ruler recieves a potsdam from Austria to show their support for Germany. Austria tells Germany that if they help them fight against Serbia, they will help them fight in any other war.
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Austria-Hungary's reaction was not well. They sent troops over to Serbia. Austria-Hungary joined forces with Germany and Serbia joined forces with Russia.
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Austria-Hungary sends troops to Serbia.
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Austria-Hungary declares war upon Serbia.
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Germany's government declares war on Russia and orders the General Mobilisation.
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Great Britain declares war on Gemany. Germany declares war on Belgium.
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Austria-Hungary declares war on Russia, Serbia declares war on Germany.
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On August 12th, 1914 Great Britain and France declared war on Austria-Hungary.
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Japan declares war on Germany and is now into the first World War.