It's always the USA... which is fine, fun and dandy.  Unless there is back-story explaining otherwise, surely other countries have survived the war. What country would you like to see in the Fallout light.  Taking into account that the "world of tomorrow" feeling is for the USA, what "vibe" or atmosphere would you associate with that country?
Example: Fallout set in Germany with a strong emphasis on the motherland and crazy dictatorship.

I think it would be weird seeing a Fallout game outside of the US, since it is essentially a "World never leaves the 50s military industrial complex" themed franchise.

I don't know if it would work as well as it does in the US... 
 
Maybe South America.

RUSSIA 
there arent enough games taking place in russia 
we need moar russia 
 
 
for a serious answer, umm.. motherfucking Africa ! cuz Far Cry 2 sucker punched us on that one

Russia. After China was bombed, they realized they couldn't inhabit their own country, and instead took over Russia.

Canada.
 
Even though it's not a country, I would like a full game set in Alaska.

" I think it would be weird seeing a Fallout game outside of the US, since it is essentially a "World never leaves the 50s military industrial complex" themed franchise. "

Fallout: New

I think Fallout 4 should take place in part in the Canadian Commonwealth. Some of the hints dropped in 3 about how much more advanced the tech is there had me interested. Maybe if the game was half in NY state and half in the Toronto area it could work.

Maybe India, mutant tigers and elephants would be cool and deadly.

Canada, they talk about the annex, but we've never been there. I still think there's a lot to do with the US though. I wanna see a game in new England more particularly in the commonwealth. Fallout 3 made it sound pretty advanced tech wise

belgium, I don't think my choice needs an explanation if it does, well....

China

Mexico might work

Guys.......its gotta be Australia

Ever since Operation Anchorage I've been interested in one set in China.

Fallout Dubai