for the Confederacy...
unique leader: Jefferson Davis. uses a re skinned model for Lincoln, with white hair, a more squared beard that is only on the chin, and no mole.
UU: Ranger. slightly faster Cavalry unit. with a plus 2 movement, and starts with Pinch. also has a plus 25% strength against gunpowder units (i.e. riflemen, etc).
UB: Draft Office. Replaces Barracks. 2 free upgrades for each unit. each unit has a lower maintenance cost. +2 happy with Nationhood.
OR
UB: Slave Market. Replaces Courthouse. +2 espionage. -50% maintenance. -50% anger duration from sacrificing population. -50% population reduction when sacrificing population (i.e. when it normally costs 4, it now costs 2).
Favorite Civic: Slavery.
New Unit: idk what to call it, but it should be a unit between the rifleman and the infantry.
the Gattlin Gun would be a nice addition too. some research would be required
and maybe a hot air balloon unit too... as those were used to some extent...
oh... and much farther, a Stealth Gunship