Very good. I believe that the south had intentions of including much of the western hemisphere in their new nation. I also believe that it ultimately wouldn't have worked, and the Civil War would have been fought all over again a generation later.
Far too many underestimate the economic drivers of a slave economy. The slave population of the south doubled every generation. To both maintain their 'investment' and future value of these 'assets' the south absolutly needed to open new markets.
While many on both sides wrapped themselves in various banners, some sincerely and others to mask the ugly realities, the bottom line is that the slave economy was totally incompatable with a free-labor market-based economy. The two could not peacefully co-exist indefinately. One or the other had to go, and all things considered, it's best that it was ended before modern weapon technology made its full presence known. We could have had a Verdun on the Ohio.