the blue and the red are the allies. the map doesn't include the united states because they hadn't declared war yet and i'm trying to avoid involving the pile of latin american states that entered the war with the united states. nor does it include the chinese opposition, except for the little dot, because china was in very bad shape at the time.
the black is the axis. it does not include spain or turkey, who were technically "neutral" but both functionally aligned with germany. the swedes were not able to truly maintain neutrality, either. nor does it include iran, which was invaded by britain to prevent it from aligning with germany, or the various "arab opposition groups", which were all aligned with the nazis. the saudis are best understood as an arab opposition group, in context. technically, saudi arabia was also under british occupation (following world war one). ukraine was aligned with the nazis as well, but that's difficult to describe in a map like this.