* Henry Morgenthau Jr.: secretary of Treasury during Roosevelt, one of the main designers of the New Deal, of financing the US war machine during WW2, and also one of the US negotiators at the Bretton Woods conference
* George C. Marshall: chief of staff of the US Army, organized the victory in WW2, came up with the eponymous plan and carried it forward politically. secretary of State after the War
* Dean Acheson: main designer of the Marshall Plan and of NATO, and one of the US negotiators at the Bretton Woods conference. secretary of State after Marshall
Shame the US didn't manage to reproduce it in Irak.
As far as "who set up the US empire, in all its complexity?", I'd argue for the 4 guys I named in my other comment, but your list might differ. And if you're just interested in the dollar system per se, I'd probably go with Harry Dexter White, who strangely enough turned out to be a Soviet spy.
Oh, and if you want a pretty clear analogy from Bismarck's system to earlier US monetary history: Benjamin Strong got the Federal Reserve System up and running and figured out a bunch of the right tricks, but he died in 1928 without getting his successors up to speed on how to run things. They failed miserably in next couple years. Bad timing!
It's just that the USA was so dominant after WW2 that it took about a century for the structure to collapse.
A better model than seeing Trump as a wrecking ball, is seeing him as a high stakes gambler, with middling skills -- in the same way that George W Bush made a big bet on the middle east and lost the chips.