Word for admirer of American culture?

America is a vast conspiracy to make you happy.
– John Updike

There does not seem to be an agreed term for us admirers of American culture
- as you can see from the number of Google references here:

yankophile 945
americanophile 716
americophile 233
americaphile 150
usaphile 14
usphile 1

Contrast this with the words used for fans of French, English, Chinese or Japanese culture

anglophile 102,000, francophile 84,700, japanophile 20,400, sinophile 3450

Why is this? Snobbery, perhaps - a 'new' culture looked down on by traditional ones? Or is it just linguistically awkward - americaphile really isn't a pretty word.

English FAQ Teaching Pack  for only £1.99

You might want to check out: 

• (audio) discussion about the relationship between British and American English here.
• Time Magazine piece on The Next American Century

The New American Century * Alistair Cooke's America