Wodan made a pretty good point on how to evaluate civilizations (bringing up Sweden vs. Denmark again)
These points:
- representative of a geographical region (which does not already have representation)
- representative of an ethnic group
- increased sales because of being in the region in question, or belonging to that ethnic group even if living elsewhere
- duration of existence
- size of empire or trade influence
- scientific discoveries / advancement
- cultural history (great buildings, literature, drama, music etc)
- military history (explains itself)
And give points from 0-10 accordingly.
I'd give Denmark these points:
Geography: 2/10. Europe is too populated already.
Ethnicity: 1/10. There are 3 Germanic civilizations in the game already.
Sales: 2/10. Danes are not numerous people.
Duration: 7/10. Their lands have only been conquered once, in WWII.
Size (at it's height): 8/10. The Kalmar Union was sort of a Danish Union, everything was ruled by the Danes and everything, and together, the Kalmar Union was larger than modern-day France, Spain and England together.
Scientific: 4/10. Below average, although they have great persons like Tycho Brahe and I would call being the first country to legalize porn a scientific thing

Cultural history: 5/10. H.C. Andersen and co. are good, Legoland gives an extra point too

Military history: 7/10. Conquering England is an achievement to remember for the rest of times.
Total: 36/70.
And then Sweden:
Geography: 2/10. Same as Denmark.
Ethnicity: 1/10. Same as Denmark.
Sales: 3/10. Judging by the number of people on these forums more Swedes play the game than Danes.
Duration: 8/10. The country has been neutral and never *publically* conquered.
Size (at it's height): 5/10. It wasn't huge but never small.
Scientific: 6/10. Sweden definitely beats Denmark here; Alfred Nobel, Carl von Linné...
Cultural history: 4/10. Meh. Astrid Lindgren adds an extra point.
Military history: 6/10. Beating Russia, Poland, Denmark and Germany couldn't have been easy (even though they were later defeated).
Total: 35/70.
People probably disagree with me, but that's okay.
Now let's take Scandinavia all together:
Geography: 2/10. Europe..
Ethnicity: 1/10. Germanic people..
Sales: 5/10. There are..what? 25 million Scandinavians?
Duration: 8/10. The area has never been completely under foreign rule and 1500 years is quite some time, even though little compared to China, Ethiopia and some others.
Size: 8/10. Same as Denmark.
Scientific: 7/10. Carl von Linné and Tycho Brahe on the same team

Cultural history: 8/10. H.C. Andersen, Astrid Lindgren, Edward Grieg and Snorri Sturluson

Military history: 8/10. The medieval Danish forces and renaissance Swedish forces combined

Total: 47/70.
Poland, Austria, Polynesia, Assyria and others would own Sweden and Denmark if they stood alone.