I do not think anyone has thought of this before but what if China is a member of the Axis in WW2. I have seen threads on Axis China and an Allied Japan but could it be possible for an Axis China with an Axis Japan in 1939?
That to happen would require 1. Japan giving up Manchuria 2. Japn looking to other areas to expand, perhaps the Pacific. While i see the latter possible, while being quite a big ripoff, I seriously doubt the possibility of Japan giving up Manchuria. The substainability of the Alliance would be doubtful as well.