Hmm... this one`s hard, and it might go back a very long time. Since there is no border between Canada and the US, I`m guessing that means something along the lines of successful US occupation of Canada during the war of 1812?
The Ottomans and the Russian neutrality is curious. Hated enemies for at least a half a century and they aren`t fighting each other? Hmm...
I`m guessing China became "forced to ally" because Japan attacked them, seeing as they are the blue color of "conquerers or territory". Perhaps Japan switched sides in the war, and snatched up French colonies such as Indochina instead of German ones, because it seems that Kaiser Wilhelmsland isn`t conquered. (I do wish that there was a key of alliances, though, but I guess that`s the challenge.)
France is probably down, defeated by Germany. Spain, though... Perhaps German aggression drew them in? (I thought Germany and Spain were friendly?)
The conquered parts of Africa make sense. All of the conquered territory seem to be French and Belgian, probably seized by Germany when the two countries went down.
Native movements appear to be happening all over, in India and Egypt and Anglo-Egyptian Sudan and the like... seems natural, but did it happen OTL?
The Germans probably conquered Sweden and a part of Norway. Since Greenland and Iceland were owned by Denmark at the time, Denmark`s defeat brought those under German control. The little slivers of conquered territory on Nova Scotia and Labrador are VERY curious... I think I`ll go out on a limb and perhaps say that Norse colonization of North America continued to modern day, eventually fallen under the jurisdiction of Norway? But if that happened, Greenland and Iceland probably stayed Norse...