Question

Who were the responsible for the first world war ?

Answer 1

It was the militant Serbian nationalist who assassinated Archduke Franz Ferdinand, the Austro-Hungarian prince whose killing led to his nation's declaration of war on Serbia, which had a domino effect as other countries entering the conflict.

Answer 2

Austria-Hungary declared war on Serbia after serbian nationalists assassinated Archduke Franz Ferdinand and his wife, this was not necessary as only a few serbians participated and these assassinations usually did not result in war("World War One: 10 interpretations of who started WW1").