Why did the situation in the Balkans become aggravated?

The national problem closely linked the fate of Austria-Hungary with the fate of the Balkan countries. Its southern and eastern outskirts were inhabited by peoples who had nation-states directly outside the borders of the empire, primarily Serbs and Romanians. In Austria-Hungary, they feared accession of these peoples to Serbia and Romania and tried to prevent this. As a result of the Russo-Turkish war and the subsequent Berlin Congress of 1878, independent young states were formed that had mutual claims against each other and against Turkey. The knot of contradictions led the Balkans to become the “powder magazine” of Europe.

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