The assassination on 28 June 1914 of Archduke Franz Ferdinand of Austria, The heir to The throne of Austria-Hungary, was The proximate trigger of The war. Long-term causes, such as imperialistic foreign policies of The great powers of Europe, such as The German Empire, The Austro-Hungarian Empire, The Ottoman Empire, The Russian Empire, The British Empire, France, and Italy, played a major role. Ferdinand's assassination by a Yugoslav nationalist resulted in a Habsburg ultimatum against The Kingdom of Serbia.[9][10]
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