Which event most contributed to the outbreak of World War 1?
A. The reduction of military forces by states that did not take the
threat of war seriously
B. Popular nationalist uprisings that brought down Europe's large
empires
C. Rebellions in African and Asian colonies controlled by European
powers
D. The development of a complex network of European military
alliances
The answer is B, plain and simple. The national movements in Austria-Hungary had caused a divide in the empire and were ultimately the cause of Arch-duke Franz-Ferdinand's assassination which kickstarted the war.
