Infantry tree needs work. You have Guerrilla=Rifleman, but coming in later, and Partisan=Musketmen, same thing. Before and after those two everything seems fine in terms of infantry, but those are redundant.
Either Partisan and Guerrilla need some kind of special coolness, or they need to go. Maybe you could make them move faster, or give them higher attack and lower D, I am sure that they already ignore some terrain, but really they need something to make them stand out besides the fact that they have different reqs and anim. Something that makes them at all worth the time to build.
I like how you put pikemen with Chivalry, makes sense splitting them off like that.
Moving the carrier was a good idea too... but don't you think it would make more sense to put it with the bomber and fighter than with the paratrooper and marine?
That tech needs a new name too... Advanced Tactics possibly? Not a very good name, but goes along with Advanced Flight for the other non-reqd tech.
How about slightly bumping up the Biplane bombard; it would make it a little more useful... no, it really wouldnt, would it... ;p
Not really understanding the logic behind balloons... especially with them being that far forward on the tech tree. Balloons as recon were used in American Civil War, and knowing how far behind both sides were technologically in that (think about how machine guns were already widely used twenty years before, and the Americans have muzzle loading black powder rifles), I have a feeling that balloons were much earlier than... say... the Destroyer. Perhaps put them in Steam Power?
Just as a curiousity statement, why are the most famous road builders in the world (Romans) not an industrious civ? Its true of regular civ too. Dat does not make sense ;p
K well its pretty late here, so Im going to bed.