I think perhaps what the US delegation is looking for here is some kind of American veto on the peace proposals 1.1 and 1.2? Possibly a veto where the US gets to reject making peace with Japan and continue a limited war? In which case the effect could be to keep all parties inside the conference but anything and everything related to bilateral US-Japanese territorial concessions would be taken off the table.
I would agree that a US veto over Proposition 1.1 makes sense, as they are the only other power with a significant investment in the war with Japan - Turkey is no longer actively engaged on the Russo-Japanese front, and the minor powers have no involvement aside from France who cannot back up a veto so far abroad.Actually that makes sense. After all, whilst the US is currently in the Comintern, it is clear that they are their own power in a different area of the world, and much more interested in the Pacific than the rest of the alliance. Thus, it would make sense for the US to reject a peace and pursue a limited war, at least as an option.
However I do not think a US veto over Proposition 1.2 makes any sense. There is no point in the US having a veto here while the UK does not, and I trust that our esteemed Secretary-General already chose not to give the UK a veto over Proposition 1.2 for good reasons.
Less objectively, I would note that any change to the items of Proposition 1 so late in the week is liable to upset any number of in-progress proceedings which hinge on that proposition, some already the product of multiple days' discussions. Of course, any changes to a later round would also have potential for upsetting deals being made currently, but I think this is more manageable should our gracious host see a pressing need for such changes.
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