Well I thought I had an idea, lol, but the fourth book kinda altered what I was thinking.
*bit of SPOILER*
The one thing I did get right was after Britain & France joined Germany to take on Russia, Britain underwent a Coup de'Tat (hence the title of the fourth book), where the people who agreed to fight alongside Hitler against Communism are forced from power & Britain goes back to being enemies with Germany. I called that. What I thought would happen is that US would join in the fight & do the same thing they did except they would defeating France as well, but idk if that is happening.
Plus, Japan is engaging in extreme biological warfare, which you'll learn more about as you read on