Hoping you will learn humility at your own pace 

Re:". . .you are free and very much encouraged to participate on Wikipedia. However, please do so using the article's talk page first. Repeatedly enforcing an edit, and undoing the work of others will get you blocked - that is the blanket policy, and with the exceptions of vandalism, will happen regardless of the merits of the edits themselves."

Sadly, you are overstepping your bounds as administrator.  A sub-heading does not amount to "the work of others".  It is a classification an needs to change as the content it classifies changes.

Regarding the issue of nouns like "state", "country", and "nation": I recognize that there may be a consensus in terms of style.  However, the very article in question specifies how "country" in partcular is used with respect to the subdivisions of the United Kingdom.  Certainly, you can't hold the entire population of another state in violation of Wikipedia consensus?  Clearly, there is a question of internal consistency for this page.  If the larger goal of Wikipedia has to do with conveying reasonably presented knowledge, it will not do to cling to a consensus that conflicts with the knowledge being presented.  You might be assisted by communicating with some "experts" on the subject, whether these be geographers, sociologists, anthropologists, or political scientists.  Hiding behind Wikipedia policy in the face of inconsistently presented facts is not going to help the Wiki community.