Why not set the USA in allied side sooner, as you did first (
https://www.subsim.com/radioroom/sho...&postcount=398), it's a good idea, and no need to add additional (virtual) free country :
Code:
[SideEntry 5]
Country=American
Side=1
StartDate=19410410 ; First naval engagement between an U-boat and the destroyer USS Niblack; USA formally joined the conflict several months later, on 19411208
EndDate=19450901