From the ‘going-to-great-lengths-to-prove-the-obvious’ department:
The Historical Origins of Africa’s Underdevelopment, by Nathan Nunn, Vox EU: Africa’s poor economic performance is one of the largest puzzles in growth and development economics. A large literature has emerged trying to explain the source of Africa’s growth tragedy. See for example Easterly and Levine (1997), or Sachs and Warner (1997).
African historians have documented the detrimental effects that the slave trades had on the institutions and structures of African societies. Historical evidence from case studies show how the slave trade caused political instability, weakened states, promoted political and social fragmentation, and resulted in a deterioration of domestic legal institutions.
h/t to Mark Thoma.