If there actually was a WWIII - my guess is that MANY major cities would be destroyed in the USA, Russia and China. And probably a lot of other places. I don't think that any of the superpowers can afford to allow the other guy to "still be standing". If one superpower survives, they would take over the world. But I honestly couldn't tell you what might be destroyed, and what would survive.
I don't believe we will be hit by a world super power. Instead, I believe zombies with a nuclear bomb will hit us. I also have reason to believe the zombies will be among the two billion who are killed in the war.
If you think about most American towns - people go shopping at WalMart and they buy gas at the local convenience store. Americans are heavily dependent on the distribution systems for groceries and fuel. If those distribution systems go down, the shelves at WalMart will become empty quickly. That's really the practical problem. We benefit from having a highly efficient distribution system ... everybody takes it for granted.
That is why the zombies will attack NYC, to shut down the distribution system.
I wouldn't be confident that the US Government will give any kind of warning about an impending WWIII.
I'm not counting on the U.S. government.
Jeanette Isabelle