Originally posted by ThereThatGuy
You never said where, In russia, USA would loose, We would all freeze to death. Similer to what happened to the Germans in WWII, But if it was to happen in the US than I beleave that The US would win, But it would not be about who won because it would turn into a world war. All of out allies would help all of there alies would help them. We would all die. We would nuke each other.
So in conclusion, We all loose.
Sigh. "in russia, we would all freeze to death"

You just have to be completely prepared before you attack. There's a reason why the Russian's aren't freezing to death; they are prepared for the cold.
Anyways,
Considering the alliances that Russia has and the alliances that the USA has, the US would probably win. However, this depends on many factors such as who is attacking who, who is prepared the most, and who decides to use nuclear weapons (in that case it would be a lose-lose situation because the opposition will retaliate with nukes of their own). If the war takes a long time to finish however, Russians will have a good chance at winning due to China most likely taking their side, causing a shortage of goods to the US.