Interesting...Campobello island is the only Canadian community that requires passage through the US to get to the Canadian mainland (at least during the winter). That's... complicated!
We have a community in BC called Point Robert's (a little US peninsula) that requires passage through Canada to get to the mainland (without going by boat). But since boat access is viable all year long, I suspect Americans that live there don't have the same sort of challenges as the Canadian residents of Campobello Island.
