EDIT: Still asking on what's the biggest/most decisive naval battle in the American Civil War, and how bad is the Union fleet at the end of it. There might be another Whte Rajah state coming soon, though no guarantees on how long it'll last.
Tough one, the CSA never had much naval power compared to the Union. Farragut was a southerner in the USN and he remained loyal to Washington, in fact i think he lead the naval invasion of New Orleans. It was not like the army, with the officer Corp being so divided and even if it was ships are harder to raise than regiments. And canon were likely believed better spent defending the Confederacy from Union armies.
The only famed naval engagement that comes to mind is the Monitor vs the Merrimack(CSS Virginia), a tactical draw but it stopped the Confederate Ironclad from tearing up the union squadron and may have contributed to it not being able to escape the Union armies prompting its destruction ob the Confederates. The ironclad as I recall was envisioned as a blockade breaker.
And Sarawak begins to move toward a way beyond absolutism. Still a bit too early for local representation to have too much teeth i think. Sarawak is still being formed as a nation to go with the state.
A new White Rajah state? Even if only brief that should prove interesting.