“Abraham Lincoln and the entire Northern portion of the Congress voted to make slavery permanent”
Buchanan was President when Congress approved the Corwin Amendment. It did not make slavery permanent. It only reaffirmed what the Republican Party held — that Congress had no authority over the domestic institutions of the states. (The Southern states could under the amendment have eliminated slavery at any time.) The Republicans did claim authority for Congress to prevent the expansion of slavery and Lincoln thought if its expansion could be stopped, it would wither and die. Lincoln carefully distinguished his personal view of slavery — strong opposition — from the authority he thought he had under the Constitution once he became President.
We are all aware that it did not get ratified, but the news here is that the Republicans, at Lincoln's urging *VOTED* to pass it.
Had it been sufficient to persuade the seceded states to remain, it would have been ratified and become law. Slavery would be permanent in the US till the very last state gave it up voluntarily.
The point is that they were lying when they claimed to have fought the civil war to free slaves. They never intended to free slaves when they started the war, and they didn't decide to do it until nearly two years into the war, and only then because they saw it as militarily and politically advantageous to themselves.
Their real feeling was that continued slavery was quite acceptable to them. States becoming independent of Washington DC was not.