From RAC:
I enclose savegame from a previous phase.If the U.S.A. was in default, Japan must randomly remove 2 entry markers from the Japanese entry pool. If there aren’t enough markers to remove, the U.S.A. can never declare war on Japan and must now start taking markers from the Germany/Italy pool. If there are not enough markers there, the U.S.A. can never declare war on Germany or Italy.
Say at sea phase
First impulse next turn