The war that was initiated by the assassination of Archduke Franz Ferdinand is World War I. The assassination took place on June 28, 1914, in Sarajevo, and was carried out by a Bosnian Serb nationalist named Gavrilo Princip, who sought to challenge Austro-Hungarian rule over Bosnia and Herzegovina. This event acted as a catalyst, triggering a series of diplomatic crises and mobilizations among the major powers of Europe due to complex alliances and treaties. Within weeks, the conflict escalated, resulting in widespread warfare that involved numerous countries and led to monumental changes in the political landscape of Europe and the world.