That's not what the south said at the time:
"No man, no association of men, no state or set of states has a right to withdraw itself from this Union, of its own accord. The same power which knit us together, can only unknit. The same formality, which forged the links of the Union, is necessary to dissolve it. The majority of States which form the Union must consent to the withdrawal of any one branch of it. Until that consent has been obtained, any attempt to dissolve the Union, or obstruct the efficacy of its constitutional laws, is Treason--Treason to all intents and purposes. . . . This illustrious Union, which has been cemented by the blood of our forefathers, the pride of America and the wonder of the world must not be tamely sacrificed to the heated brains or the aspiring hearts of a few malcontents. The Union must be saved, when any one shall dare to assail it." [Richmond Enquirer, 1 November 1814]
The fact is that the Hartford Convention grumbled about secession among themselves, but the final report of the convention says nothing about it. Despite that, though, the Democratic party used it to bludgeon the Federalists, driving them out of existence within a few years. ""Democratic politicians, seeking a foil to their own mismanagement of the war and to discredit the still formidable Federalist party, caressed and fed this infant myth until it became so tough and lusty as to defy both solemn denials and documentary proof."--Samuel Eliot Morison
Outstanding reference. Talk about having your sources lined up!
SELF-PING.