ThomasClark
Warlord
Makes some sense as an economic policy card. How about a phased-in diplomatic penalty? Slavery is a norm in ancient times, as you reach 1500, civs carrying slavery start to suffer diplomatic penalties, as you reach 1750, penalties get more severe, major internal unhappiness/revolt starts in 1800, etc. Diplomatically, one historic example that comes to mind: One of the reasons Great Britain did not "ally" with the South in the US Civil War was that GB had already abolished and condemned slavery (1830s).
From an optics standpoint the mechanic shows that what was done throughout history is not morally acceptable...but was a substantial part of world history and in some cases economic development. Wasn't it in Civ 4? This could be like ideology-like before ideologies come into play. If you abolish slavery, you could get some type of happiness boost and diplomatic boost with other civs that have abolished.
From an optics standpoint the mechanic shows that what was done throughout history is not morally acceptable...but was a substantial part of world history and in some cases economic development. Wasn't it in Civ 4? This could be like ideology-like before ideologies come into play. If you abolish slavery, you could get some type of happiness boost and diplomatic boost with other civs that have abolished.