Nero I think you're either incapable of or ignoring Sentynel's point...
In the Far East, China is quite clearly the biggest threat, while North Korea is right behind.
One could successfully argue for NK, due to unpredictability, but China, if they deicide to do something, could do far more.
China has the world's largest standing military, while the US has the largest total (which add active, reserve, and paramilitary units), and NK is the world's 4th largest in standing army, and roughly 8th total.
*Edit*Iran has the world's largest total military, not America. Sorry.
So, in the region, China and NK are 1st and 2nd, respectively, while India, Vietnam, and Iran are the largest (and thus pretty much most dangerous, not taking into account Nuclear capability or lack thereof) in their respective areas, moving East to West.
As for Europe, I'd go for Russia too. They found their balls and have started to walk a fine line, the one that everyone fears.
Economically, the US is still the most influential, as evidenced by our economic screw-up setting everyone else's (which weren't great to begin with) in to motion and over the edge into the recession we're in now.
I see Russia as having the most potential in the future economy, but I have doubts as to whether or not they can capitalize on it.
The Political Atmosphere there is, as usual, hectic and loaded as hell.
In North America, the US takes top spot, regardless.
South America is up for grabs, with Brazil leading in all military categories, but I know nothing of the economic situation there.
Africa goes region by region, I don't bother paying attention. War rages on and off throughout most of the place, power switches with the weeks.
The US still stands on it's hill, but barely.
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