You forgot about 100,000 black men in the Union Army and 20,000 in the U.S. Navy, mostly ex-slaves, that fought to “free the slaves”. Against almost no black men in the Confederate Army or Navy fighting to “save slavery”.
You failed to mention that slave states of Kentucky, Maryland, and West Virginia provided troops to fight to “save slavery”.
You failed to mention that Slave states of North Carolina, Tennessee, Arkansas, and Louisiana provided troops to fight to “free the slaves”
I leap to the conclusion that you believe Lincoln and his troops fought the war to “free the slaves.”
For the purpose of this post, let's stipulate that the purpose of Lincoln's war was, indeed, to free the slaves.
That's a problem for anyone that claims to support the original United States Constitution.
Although some will occasionally deny it, the original U.S. Constitution included slavery. The founders provided an amendment process to peacefully change the Constitution but did not provide a mechanism for the President to use troops to violently overthrow the Constitution and its slavery provisions.
After the House Divided speech many southerners believed Lincoln, if elected, would use the U.S. military to attack the South and to violently overthrow the United States Constitution.
Maybe he did.