Interesting.
While I've always more or less sided with the Confederacy I've felt the CSA winning Independence might have been a bad thing, mainly because of the role in world history the USA as a whole has played, and how different and bad historical happenings like WW1 and WW2 being brought to our shore by a USA and CSA who would in all likelihood not like or get along with each other.
But as for positive good in an Independent CSA? I think there is
some good. For one on such matters when a right to self-determination wins I can't call it a bad thing hundred percent. The best good thing would have the ability for us nowadays to see if the Confederate form of Government would have succeeded and even worked long term! Which on its own would have been great for studying.
As for the another possibility on good, maybe the slavery issue would have solved itself through economics, (I believe I espoused my views in another thread like this one and you
@unionblue read it and found it interesting so I won't re-hash it), and the South being freed of things like the abolitionist movement would have been free to solve it with no one to tell them how. Such sentiment I've seen in more than a few Confederate memoirs and diaries. Would that have translated to equality? Probably not, at least not right away. I can't recall exactly where in "
Three Months in the Southern States" I read it, and can't seem to find it offhand, but I recall reading where someone told Fremantle that if the North had left things alone slavery would have already died, can't recall it and I will find it, but that right there along with me finding so many other similar wartime references by lowly Confederates over the years should be a clue that there was a chance slavery could die by Southern hands. But my philosophy is that would have been the correct way for slavery to end naturally rather than the way it did, imagine the possibilities of that through Confederate victory, no Reconstruction era violence, no burned plantations and destroyed livelihoods to enrage someone and his friends who lost everything to hate the rest of their lives in bitterness, taking it out on former slaves, and no suffrage of any kind forced down anyone's throat, which has always been a recipe for bitterness and hard feelings to flourish overall in America.
It would have been a difficult road, but I feel it was possible. Economics, the rest of the civilized world shunning it, the possibility of cheap labor being more efficient, competition with free labor in a competing country like the US, along with cotton being exported to Europe more cheaply from Egypt and India, would have in all likelihood driven the Confederacy to emancipation and it done in a way where it didn't cause a great catechism in society and divide it. Of course slavery was enshrined in the Confederate Constitution, but as I've discussed elsewhere in another "What if" thread I feel the CSA would have split into a Civil War of its own, perhaps before the end of the 1870's, but I think that would have opened up the Confederate Constitution to some major amendments to make sure that didn't happen again, and whos to say slavery wouldn't have ended up on the chopping block or a possibility for it to end up there sometime in the future. To me the march of time would have brought slavery's death before 1900, perhaps before the end of the 1880's. Again that doesn't always translate to equality but when such things end peacefully, things like equality will always follow within a generation or two. Such a way for it to end would have been good as I feel the whole concept of racial violence would have been avoided.
As for anything else good? I'm at a loss. I expect the CSA would have stuck together even after a true blue civil war, and I see no possibilities of amicable USA and CSA relations in fact instances like a "Confederate Civil War" before the end of the 1800's would not be conductive to good relations as no one can tell me that the USA wouldn't pass up such an opportunity and get involved, and who could blame them. The effects of a successful Confederate war effort would galvanize many a Northerner to look down on the CSA and vice versa for a very long time, it sure did in reality with a Confederate defeat, and even exists to this day to some extent. Why would that have changed?
But that's me.