This is purely hypothetical, but it came up in a discussion with my brother, a high schooler who's learning about the Civil War for the first time.
He said that Robert E. Lee was a genius, he just fought "for the wrong side." I had to agree with him, but I threw in there that he should judge him lightly for fighting for the South, because fighting against one's home could be exceedingly hard (as history shows.)
So, if your state seceded, who would you fight for? Would you join the fight to "preserve the union?" Would there have to be some other cause for you to fight for in order to have you turn on your home? If you disagreed with the cause your state was seceding over, would you still fight with them (as Lee did?)
In reality, is fighting for something so abstract as "preserving the union" really something you'd lay down your life for? It was for Union soldiers- their letters are rife with references to that being the reason they were doing what they were doing.
I'm genuinely curious.