I don’t think so, given that she thought there is a content called ‘America’. I could be wrong; hopefully, irishgirl will be back to explain things.
Think about driving licences. All non NI residents will be placed on the ID register when applying for their next new licence (every 10 years) and will have to get finger prints, iris scans etc. NI driving licences will not IIRC be included. No-one in NI who is nationalist/republican need have a British passport- they can apply for and use an Irish passport with impunity.
If NI Nat/Reps were to be forced to carry a card stating that they were citizens of the UK there would be uproar. Hence the opt out.
I am not saying this is right or wrong. Merely pointing out the amusing contradiction.
The Irish, Manx, and (highland) Scots are descended from Gaels. The Welsh, Cornish, Cumbrians, Picts, etc., are descended from Britons. They’re all Celts, but the Gaels weren’t Britons.
I see what you’re saying, just not sure why I felt I needed to quote you again and ask for an explanation 
Lack of sleep 
From previous discussions on the SDMB, it seems to me that from the European perspective, North and South America are seen not as two separate continents, but as a single continent, America.
Well, that’s confusing. It creates a collision where none exists in American English.
Do Europeans refer to Brazilians or Mexicans as Americans? Would they ever say Honduras was in America?
OK let me rephrase and clear up some history and linguistics.
The residents of the group of islands off NW Europe before 100bc were celtic speaking but no one has shown that they were genetically mainland european celtic. The various tribes inhabiting these islands were more alike than different when compared with any outside groups. They shared a culture and probably a language (divisions grew up later than this date). Given the ease/difficulty of transport in the islands, interaction and intermarriage was more feasible on sea routes of some distance (current Scotland-IOM-NI, Wales-Ireland, Cornwall-Ireland-Brittany) than any lengthy overland groups, so cultural homogeneity was as likely across the Irish Sea from Wales, Cumbria and Scotland as for those areas with SE and East current England.
The argument is that the ancient inhabitants of these islands shared a common language and culture (imported from Europe and displacing any earlier culture and language.) There was probably great genetic similarity in this group and a genetic disimilarity with the Celts of Europe.
In later times these tribes came to be called Gaelic and Brythonic because of the divergence in their languages. Interchange continued.
Modern day English people are least likely to share this heritage, and yet are seen as the prototypical Britains, whilst those most closely associated with the historic culture/language group which developed into Brythonic and Gaelic components and who were the original inhabitants of all these islands are seen as Celts.
Scots, Irish, Manx, Cornish etc identify today with their pseudo-celtic origins wheras the English are the most likely to see themselves as British, despite this odd word deriving from a cultural group with its least input into England.
The whole field is full of reinterpretations of history which are more to do with cultural divides today than with the cultures of early pre-history.
It’s often forgotten that many Scots are of Anglo-Saxon descent.
“The Saxons soon spread Northwards. By 642AD they had captured Din Eidyn (Edinburgh) and Stirling in Scotland.
Lothene (Lothian) remained a mainly Saxon area even after the Vikings settled in the West of Scotland.”
I’ve never come across ‘America’ being described as one single continent anywhere, except here.
Sorry, I do know there are two continents in America, but “American”, when used without a qualifier of “North” or “South” can be used to relate to either of the Americas, both the Americas, both of the Americas including the West Indies, or, in fact to the entire Western hemisphere.
I didn’t say "“North American” precisely because I know that Canadians don’t find it offensive.
Chill.
In German both schemes exist, but “one America” seems to be the older, more traditional one. However there is a difference between the words American for a person and America. The former means a US citizen by default because there is no other convenient word for that. Had you asked whether these countries are in America, the answer would have been yes. Brazil is just as American as Canada is, if that makes any sense. Of course even among people who count America as one continent, North and South America are often used as more specific subdivisions.
Definitely yes.
As an example of the one-America version, look at the Olympic flag: One ring per continent except Antarctica. Here nobody sees a problem with that.
Like here.
Someone could call a Canadian an “American” using it to mean the third meaning for the noun ( and would be perfectly correct in doing so), but the Canadian would probably take offense, because they’re assuming that the person meant the first meaning.
Aren’t the rings supposed to represent Eurasia, Africa, North America, South America, and Australia?
As an American, I usually refer to people from the UK, when a national moniker is required, as whatever is appropriate for the constituent part of the UK that they hail from–English, Scottish, Irish, or Welsh.
I also always found it odd to call English people British. We’re not writing in the British language, are we?
The Scots, Welsh and Irish each have their own language.
Couldn’t resist.
The Scots have (at least) two of their own.
The IOC website says they represent the five continents, but never specifies which five continents.
From living in Europe, I know its not the prevailing view. There are two continents, North and South America, its never been seen as one.
Interesting information here:
http://en.wikipedia.org/wiki/Continent
Since geography is defined by local convention, there are several conceptions as to which landmasses qualify as continents, and which might be termed supercontinents (e.g. Africa-Eurasia), microcontinents (e.g. Madagascar or New Zealand), or subcontinents (e.g. South Asia). Seven landmasses and their associated islands are commonly reckoned as continents, but these may be consolidated. For example, North and South America are often considered a single continent, and Asia is often united with Europe. Ignoring cases where Antarctica is omitted, or where the terms Australasia or Oceania replaces Australia, there are half a dozen traditions for naming the continents.
[edit]
Models
Models
7 continents: Antarctica South America North America Europe Asia Africa Australia
6 continents: Antarctica America Europe Asia Africa Australia
6 continents: Antarctica South America North America Eurasia Africa Australia
5 continents: Antarctica America Eurasia Africa Australia
5 continents: Antarctica South America Laurasia Africa Australia
4 continents: Antarctica America Africa-Eurasia Australia
The 7-continent model is usually taught in Western Europe, the United States, and Australia. In Canada, the government-approved Atlas of Canada names 7 continents and teaches Oceania instead of Australia. In East Asia, especially in the Orient, it is taught as a 7-region model since the rendition of “continent” in Chinese is similar to “island”, which connotes a separate smaller landmass surrounded by water. In China, Japan, and Korea, the English term Australasia and local translations of Oceania are most often used. The 6-continent Americas model is taught in England, Asia and Latin America but, again, it is often taught in terms of the 6-region model. The 6-continent/region Eurasia model is preferred by the geographic community, while the geologic community forgoes local differences by classifying based on tectonic plates. It is especially used in Russia, elsewhere in Eastern Europe, and Japan, which often refer to the 7-continent model as a Western cultural convention. Historians may use the 5-continent/region model in which North Africa is separated from Sub-Saharan Africa and attached to Eurasia (Jared Diamond) or the 4-continent/region Afro-Eurasian (Andre Gunder Frank).