Not really though it is a nice myth the Defenders of the Slaverocracy try and push. Until the very end of the war the leaders of the Confederacy were totally opposed to any such thing since it undermined the ideology supporting the attack on the Union. For the South the war was fought for ONLY one reason, slavery.
You're mistaken. Blacks did fight for the Confederacy. The South didn't just fight for slavery. Yours is the popular myth. The South fought the Civil War for the same reasons they almost didn't stay part of the Union after its founding. Political, economic, and social differences between the North and South were plenty of reasons for secession. Slavery was only one part of the total concern.