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.

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You might want to check out: 
The New American Century * Alistair Cooke's America