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Austria-Hungary had been given a blank cheque by Germany. this meant that Germany would support Austria-Hungary whatever happened. This meant that Austria-Hungary was looking for any excuse to start a war. following the assassination Austria-Hungary sent Serbia an ultimatum which they could never agree to. therefore Austria-Hungary and Germany started a fight with Serbia. this is where the alliance system kicks in. russia wanted access to the black sea. the best way for this was through Serbia. this meant Russia wanted to help Serbia.another reason it wanted to help was both countries were of slavic origin. then France backed up Russia due to the triple entente. Britain didnt get involved until Germany put the schlieffen plan into action whereby they invaded belgium first. Britain had made the London treaty in 1833 which meant it would protect belgium in return for it's neutrality.

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13y ago

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