All of Europe, as far as we knew, was gone. It might as well not be there anymore. Russia was gone. By the time you got to wondering where America went there just wasn't any more room for it in your brain. A world without America just couldn't happen - the global economy would collapse. Every two penny warlord and dictator in the Third World would have a field day. It just wasn't possible. It would mean global chaos. It would mean the of history as we knew it. Which was exactly what happened.