The Balkans was a Yugoslavia civil war at its heart.

I give you the Argentina/UK one, but that seriously almost didn't happen. And is really one of the last, thorny, vestiges of colonialism, like Israel.

WW1 was an Austro-hungarian civil war at its heart. It spiraled out of control because we didn't have the system we have today.

Luckily Argentina's attempt to impose its colonial will was thwarted.

No it isn't, it's about self-determination.