I always figured that was because WW2 destroyed Europe, Russia and Japan, forcing the entire world to buy from us for 30 years. I don't think it's anything that can be replicated.
Your point stands tho.
Basically everywhere that wasn't the US and Canada (excluding Pearl Harbor).
For the US it was a huge shock, for a country like Poland it was Tuesday.
https://en.wikipedia.org/wiki/September_1939#September_1,_19...
I'll be honest and say I didn't even know the origin of the quote :-))