Despite the mentioned problems with this method I still think it is a great start and should be implemented more often. The U.S. GDP is three times larger than any other economy, there is no doubt that for a lot of sites, US addresses are the norm. Even if it is not 100% accurate it would still be nice to pre-populate fields and let the city be changed if it is incorrect.
The U.S. GDP is three times larger than any other economy
Eh? The GDP of the European Union is larger than the USA.
(A lot of this now hinges on how you defined 'country' or 'economy'. I'll point out that most law comes from european level and EU passports say "European Union" on the front :P )