Firstly, completely dismissing Japan as a sovereign state. Complete disrespect.
Secondly, nuclear warfare is the dumbest solution possible. Who ever fires first must accept potentially losing the trust of all nations. No matter who fires for whatever reason. Barring an alien attack or something of that magnitide.
Thirdly, the US power does not come from its military - but diplomacy. Allies in strategic places captured by the flow of capital. The military maintains the status quo but isn't invincible. If it were, Russia would not exist. China would not become a superpower.
These are basics.