That is what happened that one time. Why do you assume that is the only way it could ever happen? Do you think that the people proposing Californian secession a

That is what happened that one time. Why do you assume that is the only way it could ever happen? Do you think that the people proposing Californian secession are entirely unaware of the Civil War? Perhaps they have learned something from that example, and don't merely aim to repeat it, as you appear to assume.