You were asking about other countries, but then listed American Samoa and Guam.................they are American possessions and follow American rules.
If specifically looking for other countries, there is Europe. With some of the countries, you would be expected to speak their language and pass their nursing boards in that language. You also have Australia, New Zealand, New Caledonia, plus all of the islands in the Caribbean.
Where ever there are people, there are going to be patients...........
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