OOC: It wasn't until 1863 that the war was about slavery. Calling it about slavery this early would have caused the border states to secede.
That is completely false. It wasn't until 1863 that the war was publicly stated as being about slavery.
The southern states seceded because Lincoln was elected president. This was only a problem because Lincoln was "ANTI-SLAVERY".
There were many reasons that led up to the war and secession, but to say that slavery was not one of them until 1863 is completely wrong.