@yazoinkergrapft Yes, the United States is allowed to declare war. If it does, the sea zone immediately becomes hostile, as there are enemy surface warships in it. However, since the United States is not declaring war until the Collect Income phase, during the Combat Move, Conduct Combat, and Noncombat Move phases the sea zone is still friendly, so the United States can still occupy it freely. On Japan’s next turn, its units in the sea zone will be starting the turn in an enemy-occupied sea zone, so the normal rules for that situation apply (those units must either move away in combat movement or attack).
Axis & Allies Global 1940 2nd - Important Notes & Setup Charts
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Notes on the Global 1940 2nd rules, mainly highlights of the most important rules as they appear in rulebooks along with some additional comments and explanations and some helpful tables:
Global 1940 2nd - Setup Charts:
https://www.dropbox.com/s/ccw97pjjrx45768/Setup Charts for A%26A G40 SE.pdf?dl=0
Global 1940 2nd - Important Notes about Rules:
https://www.dropbox.com/s/m83pt7a1o2f2iru/Important Notes for A%26A G40 SE.pdf?dl=0
Some pages as a sample of these Notes below:


See also the posts for Europe and Pacific 1940 SE versions:
https://www.axisandallies.org/forums/post/1622770
and
https://www.axisandallies.org/forums/post/1623789 -
A Always Wanderer referenced this topic on
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A Always Wanderer referenced this topic on





