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Archduke Franz Ferdinand was assassinated in Sarajevo.
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Austria declared war on Serbia. Russia supported Serbia. France and Russia were allies, thus France stood by Russia.
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Russia Mobilised. When Russia mobilised it threatened Germany.
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Germany declared war on Russia.
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France Mobilises in support of Russia. Germany's military planes saw the best attack on France would be to go through Belgium.
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Germny demanded access through Belgium to fight France.
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Germany declared war on France and therefore invaded Belgium.
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Britain as an ally to belgium, declared war on Germany.