@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).
Blitzkrieg?
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All these responses clear any up any confusion, thanks guys.
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Here is the blitz rule MG Horya
EUROPE P.29, Blit z: Tanks can “blitz†by moving through an unoccupied
hostile territory as the first part of a 2-space move that
can end in a friendly or hostile territory. This complete
move must occur during the Combat Move phase. By
blitzing, the tank establishes control of the first territory
before it moves to the next. The second territory can be
friendly or hostile, or even the space the tank came from.
A tank may not blitz through a territory that contains
an enemy unit, even if the unit is an AAA (antiaircraft
artillery), industrial complex, air base, or naval base. -
Thanks for the clarification guys.





