Considering none of my comments have had anything to do with the DOI, I should ignore you, however the short answer is YES. The DOI basically says that when the government is governing in a way that free men can no longer tollerate, they have a right to sever their ties to that government.
That was a different time and trying to judge them by todays standards is crazy. They did nothing illegal, except try to extracate themselves from a government that by their standards had exceeded its Constitutional authority. Remeber the 10th amendment, it plainly states that there are no implied authorities in the Constitution, the federal government only had the specifically enumerated authorities.
When the federal government started expanding its reach and they had enough, they cancelled the contract that they had entered into. As free soverign states, they had that right, show me in the Constitution where it prohibits a state from succeeding.
Now, answer my question.
The Supremacy Clause of the Constitution made secession illegal, and the restoration of the Union justifiable.
Your full of crap, let's see if you can come up with a rational justification for that assertion. I'll bet you can't.
What did you say about pins dropping? Come on hero, you said it, back it up.