<...> tyranny is a central theme of American history, that racial exploitation and racial conflict have been part of the DNA of American culture.

The subject of British abolitionism has long been controversial, complex, and even baffling. It also raises the issue of moral progress in history - whether groups of reformers and even nations can succeed in eliminating deeply entrenched forms of human oppression, and if so, by what methods, misconceptions, and under what conditions?