There wont be permission given.
The right wil have to be exerted and defended.
If the side leaving has good and just reasons for it, I believe that spiritually that gives them a major advantage. Its why the first major attempt to leave failed. I believe the south may have won if they weren’t so dogmatically stuck on demanding slavery continue.
+1
Especially if the south sued for peace once they had the military advantage. Some kind of spiritual hubris operating at that time.