What freedoms did slaves have in 15th-19th century West Africa? Were their children usually slaves? Were many American slaves previously put to work by local African leaders? Were European slavers and slave-drivers influenced in any way by African slavery?
A good source that discusses the differences between the different slave environments is, The Half Has Never Been Told by Edward E. Baptist. You'll get a since if the differences between how the early environment of the colonies treated slaves and how that changed once cotton became the main crop that used slave labor. You'll also get the sense of treatment of slaves in sugar plantations in the Caribbean as well as how the financing of slaves led to worse treatment.
To expand on this question. How would you compare slavery in America and the Caribbean to slavery in Roman times.