Jokes0 min ago
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The answer to this question depends upon whether 'the United States' means the US mainland (as Norman has taken it), includes islands (as Woodsz & sddsddean have viewed it) or simply refers to US territory. If the last of these options applies, then the answer has to be 'zero'. This is because Guant�namoBay (on the island of Cuba) is legally US territory.
Is this just a question to which the answer is useful, for a quiz for example. Or for travelling to Cuba from the US. If the latter, you can't. The USA still can't get over Castro being in control of Cuba (even after all these years), and just will not accept that they exist in terms of travel and business.