what started world war 1

The assassination of Archduke Franz Ferdinand of Austria-Hungary is widely considered to be the event that sparked the start of World War I. On June 28, 1914, the Archduke was assassinated by a young Serbian patriot in Sarajevo, which led to Austria-Hungary declaring war on Serbia. This event, combined with a complex web of alliances, militarism, imperialism, and nationalism, ultimately led to the outbreak of the war