Buridan, it seems like you’re buying into the “propaganda” of the time. Serbia was never a state sponsor of terrorism.
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“Princip was one of three men sent by Dragutin Dimitrijevic, the chief of the Intelligence Department in the Serbian Army and head of the Black Hand, to assassinate Archduke Franz Ferdinand, the heir to the Austro-Hungarian throne, during his visit to Sarajevo on 28 June 1914.”
From a leading WW1 site. I’ve just read a couple of books by top historians and this is well-established fact, not propaganda.