Why is “The Balkan Powder Keg Explodes” an apt title for a discussion of the causes of World War I?

Question

Diverse trade relations involved the region in external wars.
Ethnic tensions made the region vulnerable to conflict.
Overpopulation inclined the region toward expansion through warfare.
Differences in wealth caused revolutionary movements.

Answer 1

The option "Ethnic tensions made the region vulnerable to conflict" is the most apt explanation for why "The Balkan Powder Keg Explodes" is an apt title for a discussion of the causes of World War I. The term "powder keg" implies the potential for explosion or conflict, and the Balkans were known for their ethnic tensions and political instability, which ultimately contributed to the outbreak of World War I.