2nd Screen:
Quite funny that Denmark is obviously the most populated region at all followed by Stockholm region.
The big Cities of Europe (London!!!, Paris, Berlin) are plain green. What the hell happened ?
Note what Darkrenown said; "all nations are only comparing internal population, so a green state in China or India might still have a lot of pops.", and the date.
The shading appears to be determined by relative population density compared to all other provinces of a nation. London and Paris probably have high populations compared to other European provinces, but the British and French likely have extensive possessions in Asia; provinces with very high populations.