Um, it adds a lot, theres a pre-WW2 mod, the space mod, an X-Com style mod, and this mod that adds another tier of units after the future age, like mechas and stuff.
Don't forget "Ryes and Fall of Civilization" I comes with BTS and it's a historically accurate earth 30+ civ maps. Other features are; Historical victories, conquests, and the fact that entire civilizations can break into civil wars then eventually break apart themselves.
were funding the pirates.
forget the loving forgeters