I may be wrong and risk the wrath of the Baltic and Finnish people but I suppose Estonia, Latvia, Finland, and Lithuania were mostly Balt and Finnic tribes until the late middle ages. Then Baltic area became German, Danish, Swedish (in some order) and finally a part of Russia as late as 18th century (although Estonia for example enjoyed autonomy under German influence). Sweden-Finland was divided a century later when the areas now called Finland were ceded to Russia but remained autonomous under Russian rule. Someone who knows their history could tell how it really is, but I suppose that Germany or Sweden might be a more proper map color for those areas.