Gavrilo Princip, a Serbian nationalist, murdered Archduke Franz Ferdinand in the small Balkan city of Sarajevo in June 1914. Europe had previously experienced several high-profile assassinations in the years preceding this one, all of which horrified the international community but did not precipitate a significant crisis. This occurrence caused widespread concern throughout Europe... https://worldswar3.com/the-top-10-causes-of-world-war-i/