5.5 Million tons. Most of it owned by people in the paid labor states. There was an ocean going fleet, a fishing fleet, and a whaling fleet.
But the boats that mattered plied the internal rivers, the Great Lakes and the canals in places like Illinois and New York. The shipments to and from Panama usually had escorts, but Semmes did capture an outbound ship headed towards Panama. The ship was loaded with marines, whom he paroled.
Lincoln's point in the preliminary report, the US fleets lose about 125,000 tons per year to wrecks and decay. Semmes effect was like a bad storm season. And the ocean going fleet was never rebuilt in US ports, and Congress did not invest much in the navy either after the US Civil War. There was money to be made in railroads, steel and a thousand different applications of steam power to industry. I think there may have been some progress with respect to kerosene, gasoline and internal combustion. Is that where US investment money went?