Look what this US Citizen thinks of a secession of California... Civil War...

So extrapolate to Spain... it is the same...

https://steemit.com/calexit/@randr10/a-message-to-my-fellow-californians-and-calexit-why-i-would-leave-if-california-secedes

"If they try to go through with #CalExit, it will certainly mean civil war, and the losers would almost certainly be the secessionists. It’s reason enough that they will be on the wrong side of history to not support their cause"