Why was the Balkan region referred to as the powder keg of Europe prior to World War 1?

The Balkan region was referred to as the "powder keg of Europe" prior to World War I due to its complex mix of ethnic tensions, nationalistic aspirations, and political instability. The decline of the Ottoman Empire led to power struggles among emerging nations, exacerbating rivalries among ethnic groups. The assassination of Archduke Franz Ferdinand in Sarajevo in 1914, a direct result of these tensions, triggered the outbreak of the war, showcasing how volatile the region had become. This volatile mix of factors made the Balkans a potential flashpoint for wider conflict in Europe.