These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Sealand beat the shadow, which nearly every other nation lost to.
The topic of nations being recognized as such by normal humans and exactly what abilities or unique traits that nations have, if any, has been touched on a couple times during the course of the event, but never directly addressed. A newscaster reports on the disappearance of 'those people' which seems to imply that this fact is common knowledge, at least to certain members of society.
Then again, the latter could also suggest that while a good deal of people may know of them as important figures of some sort, the real truth of their existence is kept a secret. Or alternately, the public is in on the whole story in some fashion but prefer not to talk about it much.