Original sentence: However slavery was the cornerstone of the South's plantation economy; yet it was repugnant to the moral sensibilities of most people in Britain, which had abolished slavery in its Empire in the 1830s
Edited sentence: However slavery was the cornerstone of the South's plantation economy and its system of white supremacy; yet it was repugnant to the moral sensibilities of most people in Britain, which had abolished slavery in its Empire in the 1830s