If the south had prevailed in the Civil War, the world might look very different today.
It’s quite possible other states would have seceded from the Union over other issues, if the Confederate states won their independence. It’s quite possible there would be multiple countries in the land mass of the United States.
The implications of that are thought-provoking. Among other things , the United States may never have become the Supreme superpower that helped win World War II. The Axis powers may well have won World War II , without the United States intervening on the side of the allies. Because it’s quite possible there would have been no United States as we know it today.
But we’ll never know so it’s irrelevant.... Just wishful thinking on my part.