Well, the abolitionist movement certainly was..........
Get real. Even politically correct historians are beginning to admit that 'slavery was the cause for the war' is an oversimplification and has been the PC party line to appease the blacks.
Besides, everybody knows that Longstreet was bitter following the war. He was the only former Confederate officer to join the Republican Party during Reconstruction.
I believe you’re forgetting about “Fightin’ Joe” Johnston, who commanded the CSA for much of its life and was appointed Customs Commissioner post-war.
OK. So Longstreet was bitter after the war.
What then was the issue of the Vice President of the Confederate States of America, when he gave the Cornerstone speech?
You remember that one, right?
Here’s an excerpt: “The new constitution has put at rest, forever, all the agitating questions relating to our peculiar institution — African slavery as it exists amongst us — the proper status of the negro in our form of civilization. This was the immediate cause of the late rupture and present revolution.”
The last sentence is pretty clear, doncha think?
That's something that can be googled pretty easily. General William Mahone became a Republican Senator from Virginia. James L. Alcorn, Republican Senator from Mississippi, had also been a Confederate General. Charles Pelham and Charles Hays were Confederate officers who became Republican Congressmen from Alabama.
General John S. Mosby also became a Republican. He also believed slavery was behind the war, and said: “We went to war on account of the thing we quarreled with the North about. I never heard of any other cause of quarrel than slavery.”
Fun fact (or factoid, I don't know how true it is): as a boy in California, George S. Patton knew Mosby, who reminisced about the war with him and staged little mock battles. Another fun fact: Longstreet also became a Catholic. Father Abraham Ryan, known as the “Poet Priest of the Confederacy,” played a role in his conversion.