Asia and Europe are more closely connected (share more land mass boundaries) than
North and South America are. So is calling Asia and Europe two different names a mistake?
Mem, your argument plays on two levels.
Firstly - on a real world (national) level someone calling themselves American
would likely be assumed to come from the USA. I don't think this is really a stretch.
Secondly, and perhaps more esoteric - On a geographical/Continental level someone describing him or herself as American
could hail from any one of about 35 'countries'.
I tend to draw a distinction between South America, Central America and North America, simply because they (people, customs, geography etc) are so very different. But in geological terms they are
one continent.
I think it would be somewhat unusual for someone from say, Chile to call him or herself
American rather than
Chilean but on a continental basis they
are entitled to do so. On the same grounds a citizen of Stanley is an
American too. A native of New Zealand is Australian, alongside a native of Papua New Guinea.
I do agree it would be something of a misnomer and likely cause great offence in some places but it would be,
technically correct. Generally people don't because they tend to describe themselves in national terms, and on that level you have a point. In terms of entitlement, much less of one.
This should be self evident. I could should I so wish, call myself English, British
or European or merely Human if we want to be anally pedantic - but clearly that's more your bag, eh Mem?.
Your argument about shared land mass boundaries is entirely irrelevant, that's a matter of geography. For a start there is only
one - the same number that divides North, Central (you forgot that one) and South America.
Actually, if you want to be precise you forgot to include Africa because it's
also joined to both Asia and Europe to form the pseudo continent of Afro-Eurasia. In short, they are physically connected, how much closer can one get?
Ethnic considerations aside, all citizens of the USA are Americans but not all Americans are citizens of the USA. In the same way that all English are European but not all Europeans are English. At a smaller scale - all English are British but not all British are English.
These descriptors cease to be interchangeable only at
national level.