The Union *DID* accept secession. They did so on July 4, 1776. They wrote a document in which the stated explicitly that it was a natural and God given right to become independent of a nation that no longer served their interest.
That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness.
What you mean is that Lincoln rejected this fundamental and natural law based principle expressed in the Declaration of Independence.
But prior to Lincoln, the *UNION* accepted secession. The *UNION* was founded on it.
Show me an example of a document signed by Lincoln that attested that he accepted ‘secession’.
You’re just posting crap.