So in other words, you are now admitting what you just denied - that Lincoln attempted to enforce his tariff at Sumter.
Charleston was a harbor in the United States.
The de facto situation of secession says otherwise.
No, the Revenue Service was tasked with protecting the ports and coastal waterways of the United States. They are the precursor to the modern Coast Guard, but were under the command of the Secretary of the Navy. They were not tasked with collecting duties, that was the Treasury Department.
The de facto situation of secession says otherwise.
De facto my foot. The confederacy was not an independent nation in 1861 and was never recognized as such by any country at any time. Charleston was a city in the United States.