"Now it is clear the enormous damage the Slavers did to the entire region as well as the Union."
Are you talking about the United States of America where the Federal Goverment had no law banning slavery in an organized state until after the Civil War began?
I am talking about the United States which was treacherously attacked by Slaver forces. The same nation which had bent over backward to mollify the Slaver demands; which used its forces to return slaves to the whip and the lash even from states where it was illegal; which had been controlled for almost its entire history by Southern presidents, Southern congresses, Southern Supreme Court justices. You must be unaware of that United States.
Lincoln was not going to free the slaves but he WAS going to preserve the Union and suppress the insurrection instigated by the Party of Treason. Just like its namesake today America was threatened and its war effort weakened by the Democrat Party in the South and North.
It was only for the South that the war was about slavery. And for the South that was ALL it was about.