Of course you're an Olympic level gymnast when it comes to your tortured logic, so I'm sure you'll try to worm your way out.
I guess you just completely missed the dates in question. The Horizon was built in a South Carolina shipyard in 1797, I think. By 1860, there weren't any Southern shipyards left except the Navy shipyard in Norfolk.
If you will once again read through Robert Rhett's address from South Carolina, you will see he mentions the destruction of Southern ship building as one of their grievances.
Then you claim the South had their own ships. How do you reconcile the fact that if they had their own ships then there was no need to use anyone else with your claim of coercion ?
In the 1790s they were building ships. By the 1860s, they had ceased. The Northern shipping industry was like a closed shop. They favored their own, and were quite clannish about it. The government favored them too.
Of course you're an Olympic level gymnast when it comes to your tortured logic, so I'm sure you'll try to worm your way out.
Yes, pointing out that things change in 60 years is a diabolically clever trick.