Greetings, Friends Across the Two Ponds:
Of course, as per other posters' recommendations, I could Google this; I have and remain, not totally confused, but wanting the straight dope as well as nuanced meaning. I'm both curious and needing to know for purposes of editing works of American and British writers.
I like and want detail. It's crucial when I have to distinguish between bathroom/lavatory; I went to the hospital/I went to hospital; My family shuns me/My family sent me to Coventry. But, in keeping with the OP, I want, principally, to understand how you call yourselves and how you designate the diverse parts of the kingdom.
I saw a movie recently where, in an opening scene, there is an aerial shot of London. In the lower left-hand corner is the title, London, UK. In older films, it would have been referenced as London, England.
So, there're the British Isles, The United Kingdom, and a separation, I gather, of Ireland from Wales, England, Scotland, . . . Then, the Commonwealth. Do you members from Australia, New Zealand, Canada, [anyone else?] refer to yourselves as members of the Commonwealth? Is there a shorter, snappier term? Or would one just say, for example, "I'm a New Zealander"? I can figure out Canadian and Australian. A citizen from Wales is Welsh (I think).
As earlier stated, even here in the US, we have the formal but more commonly used colloquialisms that indicate our origins, our nationality. I'm a Californian and an American (I think).
Yet, there's North America, Central America, South . . .