Hi YannMo and welcome to the forum.
First to clarify. I believe you are thinking about two different documents. A title is only the document showing ownership
of the boat. You will also need some form of registration
which is like the license
tag on a car. It is very easy for anyone, even non US citizens to get both of these in the state of Florida. You should also know that in the USA there are two ways to register a boat. Registration
with a state as already mentioned or federal registration through the US Coast Guard which is correctly called Documentation
. Documentation is not allowed for non citizens and if you buy a boat that is documented you will have to go through the process to remove the boat from the USCG system and then get state registration.
Since the boat will not be USCG documented there is no concern about them canceling your documents. Also I don't think there is any problem with Florida for this.
Regarding Cuba I cannot say what documents they require for a boat but I do know they are welcoming yachts and would think any official paperwork would be acceptable.
Sent from my SCH-I545 using Cruisers Sailing Forum mobile app