You use the word "rebellion" in a country that specifically states it is everyone's right to form a government that suits them. A country that was specifically founded on the idea that you had a right to leave a larger country of which you no longer wished to be a part.
I would say that in a country that has stated such a premise in it's founding document, any effort to stop a breakaway is unprincipled. Far from being a rebellion, it is the ultimate statement in support of the very foundation of this nation. The right of association also asserts a matching right of disassociation.
Those who deny this right are the actual rebels.
So what do you think the US Constitution is talking about when it says the right of habeas can be suppressed in case of rebellion?