Yes, this is the correct question, for the right forum. The nations have their levels.
How do they level up? I know that they can raise their level quite quickly by Challenge, but I believe that there is some other way (e.g. nations with 40th level, but with no or very few championships points.
Does anybody know about some "leveling up equation" or rule?
Please do not answer with "the challenge is no longer supported" gibberish.