I find it strange that secession wasn't consider illegal until after the war. If this act wasn't criminal prior to the war, then why would states leaving the union result in combat? I know the Supreme Court ruled it unconstitutional in 1868, although I'm not entirely sure I got the year right when the Supreme Court made the decision. Perhaps it was because the act show an image of lawlessness. I don't know but if anyone can give me clarification on the issue, I would appreciate it.