State[s] were sold a bill of goods.
To deny the right of secession, is to deny , Several States
joined with the understanding - they could re-assume their delegated authority.
After the fact, you can find people claiming different.
New York
We, the delegates of the people of the state of New York , duly elected and met in Convention, having maturely considered the Constitution for the United States of America . . . declare and make known. . . .
That the powers of government may be reassumed by the people whensoever it shall become necessary to their happiness;
Federal #43 To the People of the State of New York:
A compact between independent sovereigns, founded on ordinary acts of legislative authority, can pretend to no higher validity than a league or treaty between the parties. It is an established doctrine on the subject of treaties, that all the articles are mutually conditions of each other; that a breach of any one article is a breach of the whole treaty; and that a breach, committed by either of the parties, absolves the others, and authorizes them, if they please, to pronounce the compact violated and void.
Even is one believes that secession was a right, how was the mere election of 1860 a justification for secession?