Question

How did the balkan issue was one of the major factor responsible for the first world war

Answer 1

Serbia, Greece and Bulgaria were under Turkey which was called the Ottoman Emperor.These states wanted independence because of despotic rule of Turkey due to the right of nationalism.Islams made the Christians their victims. So, there was frequent war to the Balkan region. So, to initiate the first word war, Balkan countries were also responsible

Answer 2

The Balkan peoples based their claims for independence or political rights on nationality and used history to prove that they had once been independent but had subsequently been subjugated by foreign powers.
During this period the there was intensive rivalry.
this led to series of battles which led to the First World War.