@Marshmallow-of-War Japan and the UK…or in your shoes ANZAC ( as UK and ANZAC are two together ) can go to War against Japan. This may be a vurble announcement at the start of ANZAC’s turn, or your combat move to attack Caroline Islands is enough to lay the point of direction…‘ANZAC and UK at war with Japan as well as Germany/Italy’…this of course before Turn 4.
The State’s however may still be sleeping and doesn’t want a part of the War yet till beginning of Turn 4. The US can still b4 turn four do a declaration of war against Japan to bring them into the game, enhancing there extra 30 IPC’s.
Did this help your wondering Marsh?
BH