I noticed that if you do all you can, you avoid war completely with poland.
I didn't join the Allied (when UK offers alliance), I gave Danzig away (got crappy 20 dissent!) and basically everything to avoid war, I'm still looking into if it stays like this the whole time.
But somewhere in november 1940 Germany declared war on romania.
I'm seeing if this stays like this untill 1945.
I'll post an update on this tommorow
Pretty randomised, just because it doesn't do this once doesn't mean they'll always do that.
And to be honest, you're an incredibly easy prey for Germany if you're not a part of any alliance.
(Even when you are in an alliance you're an easy prey :p)
BTW Epic post count