So I was thinking about the Slavery Civic idea and I came up with these
Slavery
-None: no effect
-Foreign Slaves: Ability to capture, buy, sell, and keep slaves. Settled Slaves give -1 :food: +2 :Hammers:, +1 :gold:
-Indentured Servitude: Unlimited Slave Specialists, +1:mad:, -5% Crime...