The war to preserve federal revenue was almost waged several years earlier. When two sides don't like each other all that's left is the excuse (..tariffs, slavery, evil southrons, siding with the enemy in 1812, nasal voiced, sucky food, socialism, 48ers, etc )
Your answer simply states your opinion about Lincoln and his motivation for issuing the emancipation proclamation, but says nothing about the rightness or wrongness of his action
In the Conkling letter before mentioned, I said: Whenever you shall have conquered all resistance to the Union, if I shall urge you to continue fighting, it will be an apt time then to declare that you will not fight to free Negroes. I repeat this now. If Jefferson Davis wishes, for himself, or for the benefit of his friends at the North, to know what I would do if he were to offer peace and reunion, saying nothing about slavery, let him try me (
). The Living Lincoln. p.613-615
No principle, that is possible to be named, can be more self-evidently false than this; or more self-evidently fatal to all political freedom.
-- Lysander Spooner from "No Treason No. 1"