I consider Sweden and the Netherlands good examples of (trying to build) rational nations.

They listened to Thomas Jefferson (and Victor D'Hondt) and pulled the power game down to the more normal, more human level.

So many Western societies did not succeed in bringing political power down to the human level. It is probably easier for smaller countries to do. Still, Modern Germany has a very logical system (complex if not familiar with the voting system), and showed one can have a nation based on rationality indeed.

As long as power is not brought down to the human level, then the Enlightenment did not succeed yet. Many revolutions have their counter revolutions, and the UK and the USA are prime examples where the Enlightenment got undermined later on (or...was not fully embraced from the start).

So, it depends on your culture. If you are with the Anglo culture, then the Enlightenment has not been successful. If you are with some of the other European cultures, then you can point out how far your culture has progressed beyond that Anglo level, albeit held back exactly by these Anglo nations that did not develop rationally well enough. The elitist powers held on to too much of their medieval powers.

The more competition there is for the sake of competition (again, UK and USA thé prime examples), the harder it is for the more Enlightened cultures to embrace the Enlightenment even further, since they must to some extent always compete with these competitors-for-the-sake-of-competition nations, undercutting their higher standards, involved in the race to the bottom until they win.