I have always found the rules for this contest to be a bit bizarre. Stations in the US can work Alaska and Hawaii, which are part of the US, but they cannot work Canada, which is a foreign country-usually DXing is seen as working foreign countries. But they can work Sable Island and St. Paul Island, which are both parts of Canada, and they can work 4U1UN, which is in New York City, but they can't work 4U1WB which is in Washington, DC.
Somehow this all makes sense, I just haven't figured out how yet.
73 John AF5CC