But after the southern states had announced their secession.
So there was time before the war for the North to prepare a constitutional amendment to make slavery “irrevocable” but not time to prepare an amendment to abolish it?
Since the southern states had already announced their secession and were preparing for their war then it really didn't matter what amendments were proposed.
It looks like the North didn't seriously consider the advantages of abolishing the slavery they had enshrined into the U.S. constitution.
You are aware that the 13th Amendment was passed and sent to the states while the rebellion was still ongoing, aren't you?
Of course, history records that once the high casualty figures began pouring in, Lincoln scabbed onto the conflict the notion the North was “fighting to free the slaves.”
Of course history does.
“But after the southern states had announced their secession.”
There is absolutely nothing wrong with you making tertiary comments.
But I have lost track of the point you are trying to make.