In terms of creating our monstrous federal government, I consider Lincoln on the same level as FDR, LBJ and Obama.
The book, The Real Lincoln, although containing a lot of inaccuracies, is accurate in describing all the many abuses of power he committed. And first and foremost, if a state voluntarily enters the Union, it logically follows that that state can just as voluntarily secede from it.
States just don't 'voluntarily' enter the Union. They must be approved for admission by the other states. So then it 'logically follows' that a state wanting to leave the union have the agreement of the other states.