The United States would really be stepping up their edge-game if they were to launch an attack against North Korea.

Up until now they have never attacked a nation that they 'truly' believed had WMDs (Hence why they were never found in Iraq - I'd be surprised if anybody above the ranks of the 'boots on the ground' were unaware of truth).

The only way they'd engage North Korea directly is if they were confident that they could neutralize the true WMD threat prior to invasion.

And then a central bank would get founded in the aftermath. Just like in Libya, etc.