Civs are more unique than I thought. For Example...
Galactic Empire Tech Tree
Strong Units: Mech and Troopers
* Aircraft take 5% longer to build and are 5%
more expensive
Unique Unit: Dark Trooper (Trooper)
Unique Technologies: Walker Research (Mech
Factory); Altered Bargains (Spaceport).
civilization Bonus: Upgrades to Heavy Mechs
are 5% less expensive than other civs.
http://swgb.heavengames.com/images/units/empire/darktrooperphase1.gif)