Dilandu
I'm dissatisfied, which means, I exist.
Yep. If you attack them with conventional weapons, they would retaliate against USA. If you are lucky, they would try to limit the escalation, and stike Wake, or Okinawa, or other military targets first - to clearly demonstrate, that they would not tolerate your agression. If you are not lucky, or refuse to back down - they would nuke American cities, killing hundreds of thousands (maybe millions - your civilian defense system most likely is completely unworkable, and most Americans have no clue where to find radiation shelter) of Americans.Even if they did, what next? Attack the United States?
Of course you could retaliate with nukes, and kill millions of North Koreans (albeit their civilian defense system is quite good, and they are well-prepared and disciplined, so nuclear attacks against them would most likely be less efficient - of course, you have much more bombs). But the result would be, that United States would took horrendous losses for little-to-no gain. Your career as president would quite probably end on electric chair as soon as Americans realize, that you brought them into nuclear war for nothing.