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.
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Tough call, Russia would Win in a war vs USA hands down, Russia would also get assistance from China just like Europe would get assistance from USA and vice-versa but in the end Russia and China would win
China vs. Great Brittain China would win due to their large army and their modern air force which will field a 5th gen aircraft and have a few carriers within a few years. (by 2017-2019). Britain only has about 200 modern jets at max.
China and Russia could probably take on the whole world, Russia could alone take out the USA easily and China could probably stand a good fight against EU considering China would easily just start by knocking small EU countries like Algeria, Belgium, Greece etc all out without using much weaponry. Then China would start taking out bigger countries like France, Britain, England etc and Russia would eventually back China up and destroy everyone.
Assuming there is no nukes, america, because they have better train military forces. Quality beats Quantity.
Without Nuclear explosives North America would still win. North America has better technology, men who are superiorly trained and is much richer than South America.
It is likely that US might win the war. Russia could defeat both India and China together, but they would get a lot of their soldiers lost in the battle. US has much better weapons and better, trained soldiers than Russia, making it more powerful.
The US would never fight a conventional war with China or Russia, but might support a country that did (as with Afghanistan from 1979 to 1989). Russia has a much larger conventional army, and China an even larger one. Any armed conflict would likely lead to a nuclear exchange, either limited or total. Russia has parity with the US in nuclear weapons, while China is still a distant 3rd.
Wolverine, he's the best there is at what he does
Captain America! Black Widow might be agile and quick, but Captain America is super strong and has that unbreakable shield.