You know what I dislike about the tech tree? That, at one point, it goes from 1200 to 1800 in about two to three technologies. Here:
Divine Right is tied with "L'état, c'est moi", I suspect, so put that at the late 1600's. I wonder if Constitution should be tied with the USA? Probably, so, 1776 it is. Military Tradition should probably be tied with 'esprit de corps' and the French Foreign Legion, so, 1831. That's fair enough I guess.
Paper arrived at the late 1000's in Europe, but was widespread-ish around 1200 / 1300 or so. The Printing Press is probably tied with Gutenberg, around 1440. But then we get Replaceable Parts, which is a concept from the late eighteenth century, with Napoleon and all. So we advance about 350 years with one technology. Taking the other path, we get Education, which I guess symbolises the spread of universities at the end of the middle ages (sixteenth century or so), and Liberalism which should be associated with the French Revolution (late eighteenth century). Again, we go forward many centuries with one technology.
I guess we can put Guilds at 1300 or so as well. Banking has a long history, but, I would put that either at the 1200's or so, or, what would be more logical here, tie it to Medici, which puts this at 1397. Gunpowder, in Europe, was first used
in Europe in the mid-thirteenth century, but I guess we should put this technology at the late fourteenth century, which also fits with Banking. However, the next technology is Chemistry. This unlocks Frigates, which I'd put at the late fifteenth century. However, chemistry only begins to differ from alchemy in the very late seventeenth century. So...?
There are more examples, but I can't be bothered describing them (Scientific Theory > Communism is another good example, even if we use 'Karl Marx' instead of 'formation of the USSR' - this also implies 'Physics' refers to 'nuclear physics', by the way, which I guess is possible, but...). It just feels messy.