In a TL where the WWI Central Powers are victorious, what do their treaties look like with the Powers that they have a *very* difficult time touching: the USA and Japan?
For the USA, this differs based on whether the victory is before or after the US commits significant forces to France. June 1917 vs. June 1918 (for example). For Japan, I'm not sure whose navy was superior (German HSF or the Japanese Imperial Navy) I think even if the HSF was superior that the Japanese would be willing to fight to keep at least some of their gains (China).
Some of this may depend on the UK's peace treaty with Germany. If the UK can walk away more or less Status Quo Ante by territory, Germany doesn't really gain all that much in terms of supply points or ports to attack the US or Japan.
Also, how much do AH and the Ottomans affect this balance? Ottoman ports get the HSF halfway to Japan, but that's about it.
Ideas?