WI: the USA takes Cuba in the early 19th century; later, the CSA forms with Cuba as a member?

Just a scenario that popped into my head.
The USA manages to take Cuba from Spain at time point in the first half of the 19th century and admits it to the union as a slave state.
Then, tensions over slavery happen similarly to in OTL, and Cuba rebels along with the rest of the southern U.S. states to form the Confederate States of America.

What I wonder is...
-would this Confederacy be stronger than OTL's one?

-and if it loses as in OTL, could it still end up surviving in exile on Cuba, or would the American federal government be able to take over Cuba somehow?

-and if the Confederacy does survive on Cuba, how long would it be likely to retain slavery for? I'm imagining a lot of slaveholders would flee to Cuba (similar to OTL's Confederados in Brazil but more so)
 
The Confederates still wouldn't have the naval resources to do much. Especially considering the Union may well be even further industrialized because of the naval build-up that would prelude the conflict with Spain. Furthermore, Cuba's distance from the Confederate government, the chaos ensuing if enough Cuban men go off to the mainland before the blockade is fully established, we might just barely see a notable slave revolt that creates a situation almost like a border state and their governments in exile.

The real question would be what would the Philippines do in an American civil war. No one's beating up Spain and not taking them
 
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