One high altitude EMP Blast, launched from a submarine off California, and most of the USA would be dark—no electricity, No Computers, no internet, no gas pumps, no cars, zip. One blast and we would be FINISHED. BUT North Korean would be toast from Boomer Subs unloading all they have. Who would win? China and Russia. They would rule the world as the only great powers left. Lets see how they like running the world. the USA would be finished as a great power—death would be in the Hundreds of Millions due to panic and starvation—and crime that would flourish in the post war America. We may well be occupied by China (they have enough troops) or the UN to keep the peace.
Yeah those submarine launches by the US Navy off the So Cal coast caused quite a stir over 5 year ago. You can bet they were testing for that actual type of attack.