I just listened to an audiobook called, "The House at Sugar Beach" by Helene Cooper. It was read by the author, a Liberian American, and although I usually like to read books in the traditional way, I was driving, and I'm so glad I heard the audio for this one because I learned that Liberian English sounds very similar to Crucian, including sucking the teeth, which the author not only does but discusses. I suppose Liberian English is probably similar to what you'd hear on St. Thomas or St. John, too, but I've never been to either, so I'm not sure. Anyway, I just thought this was neat. I'm sure it has a lot to do with similarities in the background of the people who settled each area -- it's just interesting that the same way of speaking has persisted in two completely different places.
Liberia's history may have something to do with it.