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... a visit to Guam is a visit to the United States. Practically speaking, though, it isn't. When someone says "United States," the first place thought of is not Guam, of course. So, technically, yes, you did "visit" Haiti, Patrick, even if you never did set foot outside the airport.
(A similar exercise would be to determine if John McCain, born in the US-controlled Canal Zone, is really a naturalized US citizen. The Canal Zone was neither a territory or commonwealth of the US. However, like US embassies overseas, US military bases are considered US soil, e.g. Guantanamo Bay.)