What major event is commonly thought to have incited World War I?
The assassination of Archduke Franz Ferdinand
June 28, 1914, Sarajevo, Bosnia and Herzegovina . On June 28, 1914, a teenage Serbian nationalist gunned down Archduke Franz Ferdinand and his wife, Sophie, as their motorcade maneuvered through the streets of Sarajevo. Next in line for the Austro-Hungarian throne, Ferdinand had not been particularly well liked in aristocratic circles.