Yeah it was.
It was in South Carolina and South Carolina seceded. It was sovereign South Carolina territory.
South Carolina had deeded it free and clear to the federal government. They had no legal claim to it.
Gitmo was always s sparsely populated bay on the far side of the island. It was not their principal harbor like Charleston was and is. No country would allow another to maintain a fort in its principle harbor.
It is at least as important to Cuba as Charleston was to the Confederacy. Depending on which measure you use - imports or exports - Charleston was the third or fourth busiest port in the South.
No it wasn’t. South Carolina had seceded.
It was on sovereign South Carolina territory and any sovereign can lay claim to any property within its sovereign territory.
Gitmo was never as important to Cuba as Charleston was to the Confederacy let alone South Carolina. Charleston was one of the two largest ports in the then CSA and was obviously the largest in South Carolina.