Yes, it’s in the FAQ.
http://www.wizards.com/AvalonHill/rules/AA_Pacific_1940_2nd_Edition_FAQ.pdf
Quick question, according to the FAQ page, USA cannot move units into other nations territories while USA is still neutral. So if Japan doesn’t declare war and I want to stage some units up in Alaska will I have to use transports for the first few turns until at war? It seems USA cannot walk units through Canada until at war.
That’s correct.