All civil wars involve two political entities emerging from one.
They compete and battle with each other until one wins.
Thus it has always been.
Civil wars always involve territory held by each respective entity.
These entities can call themselves anything they want, including “country”.
It does not preclude the fact they were part of one political entity, and have broken away to form a new one.
A similar case can be made for the American Revolution as being a civil war.
“All civil wars involve two political entities emerging from one.”
Emerging from one what? One religion? One race? One political party? One economic system? One hemisphere?
“A similar case can be made for the American Revolution as being a civil war.”
The Revolutionary War was America’s first civil war?
Would that make the War of 1812 America’s second civil war?