Why was the Balkan area become the most serious source of nationalist tension in Europe after 1871?

Why was the Balkan area become the most serious source of nationalist tension in Europe after 1871? Explain with examples.

The Balkans was a region of geographical and ethnic variations. It includes modern Romania, Balgaria, Albania, Greece, Macedonia, Croatia, Boasnia-Herzegovina, Slovenia, Serbia and Montenegro.
The resident of this region were known as "The Slaves"

  • The large part of the Balkans was under the control of the Ottoman Empire.
  • The spread of the ideas of romantic nationalism in the Balkans together with the disintegration of the Ottoman Empire made this region very explosive.
  • One by one, its European subject nationalities broke away from Ottoman’s control and declared independence.
  • The Balkan peoples based their claims for independence and used history to prove that they had once been independent.
  • The Balkan states were fiercely jealous of each other and each hoped to gain more territory at the expense of the others.
  • Each power - Russia, Germany, England, Austro-Hungry was keen on countering the hold of other powers over the Balkans.
  • This led to a serious of wars in the region and finally the First World War.