Did you guys not read the novel called War Day, written by Whitely Streiber, in 1984? It covered much of the same thing. The premise of the book is that America has got into a nuclear war, and won, and out of the hundreds of nukes launched against it, only 4 or 5 hit the country. Can't remember which areas, but I think Los Angeles, Dallas, Washington D.C., New York City, and Chicago.
No other areas were hit, but these hits bring the entire country to its knees, and it can't survive without massive assistance (spell that permanent invasion) from its allies, including Japan (who occupies California) and Canada (who seizes Alaska, in order to "secure" any nuclear weapons there.)
The novel is written in the form of a journal by a newspaper reporter, who travels around the entire country in the aftermath, to document what he sees. Lots of discussion of the effects of EMP.
The EMP factor is absolutely nothing new. It has been discussed for decades. Federal Regulations require all banks that are members of the federal reserve to have their main computers shield by several inches of lead casing, for the specific purpose of protection against EMP.
And, of course, and even better book is Alas Babylon, written in the early 1960s. Story of a small Florida town trying to survive in the aftermath. Lots of very useful information. (A broken down, lazy, semi-alcoholic young man, who is a second lieutenant in the army reserves, is forced to grow up fast and take charge of everything when the last act of the President is to declare martial law. In short, he is all the law that there is. ) The layers of die-off are well covered.
Regards, Mannyrock
Regards, Mannyrock