There was one reason the Slavers attacked the US and that was to preserve their Empire of the Whip and the Lash. There was NO other reason for their attack.
Any other claim is sheer ridiculousness. Lincoln did not fight the war to free the slaves but simply to preserve the Union. Freeing the slaves became a tactical and strategic policy to further the war aims. They were freeing themselves in any case whenever the Union armies appeared. Slaves were overjoyed with the prospect of Freedom like all Americans except those fighting to preserve their bondage.
American installations were attacked by the Slavers whose entire existence was based upon Terror. There was no other means of keeping the Blacks enslaved except through terroristic means: murder, beatings, ripping families apart. Thus they were clearly terrorists.
You probably thought they just loved "Ole Massa" so much they couldn't even think of leaving since your historical understanding is approximately at the level of Gone With the Wind.
Crap.
I can tell you're running out of arguments when you start standing on the caps key......
Here's a quarter. Buy a clue.
BTW: To all neoconfederates. I may be dead, but I can STILL kick your a-s!