The correct answer is the Balkans
There was a lot of multi-ethnic issues and violence in the region as the region only recently managed to get its independence from the Ottomans. This was combined with the pressure from Austria-Hungary who held a part of the region, specifically western Balkans and wanted even more. The war began when Franz Ferdinand got assassinated.
The Degüello (Spanish: El toque a degüello) is a bugle call, notable in the US for its use as a march by Mexican Army buglers during the 1836 Siege and Battle of the Alamo[1] to signal that the defenders of the garrison would receive no quarter by the attacking Mexican Army under General Antonio López de Santa Anna.
This is not a question about the subject. If u are having trouble with history, ask the question and dont just say anything