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An attack in Sarajevo in which the archduke Franz Ferdinand, heir to the Habsburg throne, is killed.

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Agreement between Austria and Germany for a possible armed intervention against Serbia, found guilty of the attack.

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Vienna sends an ultimatum to Serbia

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Belgrade accepts almost all of the ultimatum, but not the part relating to the participation of Austrian officials in the investigation.

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Austria declares war on Serbia.

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Russia, the champion of the Slavic peoples, mobilizes in defense of Serbia

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France mobilizes in defense of Russia: 1 August 1914

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France mobilizes in defense of Russia: 1 August 1914

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Germany declares war on Russia, provoking the mobilization of France in defense of Russia member of the agreement

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Germany declares war on France:3 August 1914

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Germany declares war on France:3 August 1914

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This led to the invasion of Belgium, which declared itself neutral.

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May 24, 1915 is the day on which Italy entered as a belligerent state in the First World War, about ten months after the actual beginning of the conflict between late July and early August 1914.