Well to be more specific:
The biggest German company at that time was called IG Farben, the remnants of which still exist today (Bayer, BASF).
Prescott Bush was the Director of the UBC (Union Banking Corporation) that essentially laundered money for the Nazi war machine. The assets were frozen in 1942 but later released after the war. All the attention went to Nazi Fritz Thyssen, who had conveniently "split" from the Nazis by 1940 (see the phony Warburg brothers "split" in WWI) though he maintained links to his former companies (then under "Dutch" ownership). Needless to say, his american associates were left off the hook.
Interesting article about a failed attempt by a couple Holocaust survivors to sue the Bushes and the US gov:
https://www.guardian.co.uk/world/2004/sep/25/usa.secondworldwar
Allen Dulles (future CIA director) was a lawer for a dutch bank, whose clients included Thyssen, IG Farben and Nazi Kurt Von Schroeder (who was trustee over Thyssen's "Dutch" companies).
The point here is that the multi-national power players ultimately call the shots and stand make huge profits off of international conflicts. China has been built up for just this purpose. Especially when you consider who initiated friendly relations with China: Tricky **** Nixon and ****ing Henry Kissinger.
Going back even further, FDR's family fortune primarily came from Warren Delano who made his money from trading opium in China through Russell & Company. Without the opium trade, you wouldn't have the Opium Wars.