Nedeljko Čabrinović not enough to pay for rent and food, let alone books, which, for Čabrinović, were "the only sign of life." In the meantime, he met Gavrilo Princip, and joined the Black Hand in 1912. Two years later, Dragutin Dimitrijević leader of the Black Hand, ordered Čabrinović, Gavrilo Princip and five other conspirators to assassinate Austro-Hungarian Archduke Franz Ferdinand, giving them each a gun and two bombs. On Sunday, 28 June 1914, Archduke Franz Ferdinand of Austria and his wife Sophie, Duchess of Hohenberg were assassinated in Sarajevo by Gavrilo Princip during a visit that had been announced two months prior.
World War I 1918 influenza pandemic, which caused between 50 and 100 million deaths worldwide. Military losses were exacerbated by new technological and industrial developments and the tactical stalemate caused by gruelling trench warfare. It was one of the deadliest conflicts in history and precipitated major political changes, including the Revolutions of 1917–1923, in many of the nations involved. Unresolved rivalries at the end of the conflict contributed to the start of World War II about twenty years later. On 28 June 1914, Gavrilo Princip, a Bosnian Serb Yugoslav nationalist, assassinated the Austro-Hungarian heir Archduke Franz Ferdinand in Sarajevo, leading to the July