I don't know the details of why
but Andorra and Liechtenstein are countries, Wales is a nation and Monaco is a principality.
(
OnionTerror is a bag full of sick,
Thu 22 Jun 2006, 17:49,
archived)
Meh
"A principality is a monarchial feudatory or sovereign state, ruled or reigned over by a Monarch with the title of prince or princess (a synonym is princedom) or (in the widest sense) a Monarch with another title within the generic use of the term prince."
(
spankybumchunks,
Thu 22 Jun 2006, 17:52,
archived)