In the New Zealand passport, they write New Zealand. I don't know why, but I think with the US, one reason might be that other countries in North and South America don't like the fact that the US is called America, and that people from the US are called Americans, because everyone from these two continents is an American, in a way, or either a North or South American. I know that this is something people find annoying, but I'm not sure if it's something governments argue over. It could be.
*** El Cafe ***
N400 - NYC (Brooklyn)
March 12 2010: Sent
April 7 2010: FP done- walk-in
August 3 2010: ID decision not made
December 12 2010: Lawsuit filed under 8 USC 1447(b)
March 31 2011: 31 Oath date
April 1 2011: Passport applied, picked up!