It really won’t be defined as a Civil War. A second Revolutionary War is more of a correct definition.It then could turn into a hybrid Rev-Civ War if states start to fight each other.
There actually hasn’t ever been a civil war in this country.
We had a group of sovereign states, in 1776, that decided to be independent of the central governing authority, and they won an armed conflict to do so.
In 1860, we had a group of sovereign states that decided to be independent of the central governing authority, and they lost an armed conflict to do so and were forced to remain under that authority.
201X? Tie breaker.