jul 28, 1914 - July 28, 1914 Austria went to war against Serbia.

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This is a very important date because it is the start of World War I. The reason Austria declared war is that a month earlier, on June 28, 1914, a Serbian nationalist student named Gavrilo Princip, assassinated Archduke Franz Ferdinand. Since a Serbian killed the Austro-Hungarian leader, Austria-Hungary declared war. The war might never have started without this event.

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