UnforcedError
Settler
Except that they can whip defenders if they get the barb upraising event while the no-BW team will simply die...Events are random but biassed against slavery, as slavery is (I think?) the only civic that has an associated quite negative event. I think in most of the games where you run slavery for a prolonger period, at least one city will get hit, resulting in lost production and population. So, events off is beneficial to the BW team...