Jonathan Boucher (1738–1804) English minister
he would answer - They are so, because they are cultivated by slaves. … Some loss and inconvenience would, no doubt, arise from the general abolition of slavery in these colonies: but were it done gradually, with judgement, and with good temper, I have never yet seen it satisfactorily proved that such inconvenience would either be great or lasting. … If ever these colonies, now filled with slaves, be improved to their utmost capacity, an essential part of the improvement must be the abolition of slavery. Such a change would hardly be more to the advantage of the slaves, than it would be to their owners."
"A View of the Causes and Consequences of the American Revolution" (London, Robinson, 1797)