In the special case that the US decide to enter a state of war at the beginning of the US Collect Income Phase on US turn 3, the minor factories in Eastern United States, Central United States and Western United States should convert to major factories at the same time (and not at the beginning of the US Combat Move Phase in the next US turn).
(The issue that the USA may choose to stay out of war at that point is already in the game notes.)
In the special case that the US decide to enter a state of war at the beginning of the US Collect Income Phase on US turn 3, the minor factories in Eastern United States, Central United States and Western United States should convert to major factories at the same time (and not at the beginning of the US Combat Move Phase in the next US turn).
(The issue that the USA may choose to stay out of war at that point is already in the game notes.)