23 jul 1914 año - Austria presents Serbia with Ultimatum (Serbian Perspective) July 23, 1914

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Significance: Since the ultimatum was too harsh and Serbia could not comply with all of its terms, the event led to Austria-Hungary declaring war on Serbia. This declaration of war then started a chain of war declarations that brought in all the European powers and other nations into the war due to alliances and personal gain. The ultimatum led to a simple conflict between two nations to turn into a world war.

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