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While inspecting troops in Bosnia, a Serbian nationalist student, Gavrilo Princip, assassinated the Austrian Archduke Ferdinand and his wife, when their open car stopped at a corner on its way out of the town.
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The Austrian government blamed the Serbian government for the assassination of Franz Ferdinand and his wife and declared war on Serbia.
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Germany entered into Belgium as directed by the Schleiffen Plan, Britain gives Germany an ultimatium to withdraw from neutral Belgium.
Germany did not withdraw from Belgium and Britain declared war on Germany. -
Japan declared war on Germany through her alliance with Great Britain, signed in 1902
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Turkey entered the war on the side of the central powers.
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Because of the help given by Turkey to the German attack of Russia, Russia declared war on Turkey.
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Britain and France, Russia's allies, declared war on Turkey, because of the help given to the German attack on Russia.
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Italy had originally been allies with the Triple Entante, but did not enter the war on Germany's side because they felt that Germany had acted aggressively.
