Abolitionists Abroad: American Blacks and the Making of Modern West Africa

In 1792, nearly 1,200 freed American slaves crossed the Atlantic and established themselves in Freetown, West Africa, a community dedicated to anti-slavery and opposed to the African chieftain hierarchy that was tied to slavery. Thus began an unprecedented movement with critical long-term effects on the evolution of social, religious, and political institutions in modern Africa.

Lamin Sanneh's engrossing book narrates the story of freed slaves who led efforts to abolish the slave trade by at...