The assassination of Archduke Franz Ferdinand of Austria in Savajevo, Bosnia, by a Serbian nationalist teenager, Gavrilo Princip. The Austrian government claimed, possibly correctly, that the assassination had been planned by the Serbian secret service and therefore sent a set of demands (an ultimatum) to the Serbian government. Please click on the related question for a discussion of the fundamental causes.
Archduke Franz Ferdinand
The spark that set of WW1 was the assasination of Archduke Franz Ferdinand of Austria - Hungary.
Serbia started WWI when the serbs killed the archduke of austria-hungry
The murder of a prince in Sarajevo.
President Hoover
The assassination of Archduke Franz Ferdinand was the "spark" required to light the powder keg which started WW1.
The assassination of Archduke Ferdinand and his wife was the spark that started the war.
WW1 started in 1914 and for America it started in 1917 and ended in 1918
Archduke Franz Ferdinand
the united states joined in 1917, ww1 started in 1914.!!
Both WW1 and WW2 yes. WW1 was the reason WW2 started.
The murder of Franz Ferdinand started ww1
Woodrow Wilson.
WW1 started in 1914
Ww1
No
ww1 russian comunist