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Russia. Russia could defeat any country except America and China, with or without nukes.
Iran would never allie itself with america, neither would Russia.
china would be in alot of trouble because we are the strongest military force in the world
No one. The US, Russia, and China each have sufficient nuclear weapons to lay waste to the entire globe.
I would say some of the Middle East and Anti-America people
Well it all depends on where you are at if you are in lets say Italy Then it would be America, Canada, Mexico, and so on. If you are in Russia then it would all of the countries in Europe. Then if you were in America Then it would be China and Japan.
if its a one on one fight and full blowm warfare then america would win against all countries and olny china would put up a fight. 2 super powers at the same time though would destroy america e.g Russia + India vs America= russia + india America vs India = america russia vs america = america
Russia. They have way more nukes then China.
It would be 50/50 depending on if allies are allowed or not. If no allies then America would probably just win due to superior technology. If Russia performed a surprise attack they would win due to having a quite good military and would leave America little time to react by which time they would be destroyed. If allies were allowed America would win easily due to close ties with the UK as the UK has about the second best military in the world (after America) so that's the best and the second best together making a formidable force and that's not counting the EU who would help the UK, Russia would get China but lets face it all they have is loads of unskilled people and poor technology (they are a backward country in many ways). To sum up America would come out on top in most situations. If nukes are involved we are all going to die.
Probably China. There are many discussions about this, look online.
What doesn't America import from China would be easier to answer.
Russia is the biggest country in the world (Area), so Russia would be your answer.