ah, the use of 'Caucasian' is one of my pet peeves. I is mostly used by USAnians, but I have also come across it in Singapore. Source of much confusion on the Eastern Europe branch when Americans want to know how dangerous Moscow is for a 'caucasian'.
When I got married to my American wife in the US we had to fill out our marriage papers and tick a box for our 'race'. I am a white Northern-European. I believe I could choose from 'caucasian, African-american, Native american & pacific islander, Hispanic, Mexican, Puerto Rican, Oriental, other'.
I refused to tick Caucasian, as I am not from the Caucasus and I don't look like a Chechen, Georgian, Armenian, etc. I also was confused about why hispanic, mexican and puerto rican were different categories (by that rationale there should be separate categories for , say, germans and Italians as well).
The civil servant asked me what category I wanted to choose, and i said I was unsure. She then suggested 'Oriental' (I am not making this up- and hey, Europe IS to the east of the US). She never even considered Caucasian because I am not American (apparently this only applies to US citizens and not to 'foreigners'). I finally opted for 'Other'. As my wife is a WASP, our marriage will show up in statistics as 'mixed race' even though we are both light-skinned, blond, with almost blue eyes. funny eh?