Markam makes some good points regarding Bretonia, the IMG/BMM relation being like a slightly more extreme GMG/Samura relation.
In fact, the Shire would be awesome for rescuing slaves in combination with a Percheron.
However, the point on SCRA is a bit off, since slavery is one of two contraband items that the Coalition actually stop, the other being Cardamine. You'll also notice that the Coalition candidate in the Ontario election is standing on an anti-slavery platform and would strongly appreciate your support.