Malgus, The only way tech will be gone is if there is a very large solar flare that covers the earth! But dude do you really think that China which makes almost all tech is not going to sell more to us or the rest of the world! And EMP only cover us, not Europe! Not India! Only us.
So yes five years it will start and by ten years we are back, who ever is still alive. Yes the U. S. will not be the same and China will be 100% world power.
Remember EMP only takes out a zone, if big enough maybe the U. S. but dude you still have all the rest of the world using tech!