(Okay, this is supposed to be a hypothetical scenario, but if the mods feel that this should be moved to ASB, then so be it)
In hypothetical one-on-one wars set on early 1914, between:
1) British Empire vs. United States
2) Germany vs. Russia
3) Italy vs. Austria-Hungary
Who would win?
For the sake of discussion, the rest of the world is fully neutral and there is no outside interferences at all.