
Originally Posted by
Vin
Again, Civ is trying to emulate history. Ultimately, there are no super-secret technologies that only one single civilization (or group of civs) have had, without other civilizations eventually getting their hands on, and spreading around the globe. Exception: nukes. But even nuclear technology is spreading from country-to-country every decade or so.
As for unique units, what sort of modern day unique unit would you suggest the Romans or the Greeks to possess?
The point is, empires comes and go in real life, and countries rise and fall. Due to economic, cultural, and technological reasons. Indeed, the modern United States is beginning to fall back, due to an aging education system, and other countries, like Japan, catching up, and even surpassing us on the scientific/technology fields. So there is really no reason to have the "older civs" be able to possess a unique unit in the later epochs in Civ.