It's an interesting thought. We have so, so many fictional stories surrounding "What if the Nazis had won WWII?", but none that I know of about what would have happened if the American Civil War had gone the other way.
It's easy to picture the south as just being what we think of as "The South" today, but at the time most of
Southern California was also on the Confederate side, including Los Angeles, and in fact had already peacefully voted to create separate Northern/Southern California states, but then the actual Civil War broke out and all that kind of fell by the wayside.
You'd be paying a lot more for your citrus fruits, if the Confederacy had won, is all I'm saying.