This was some really interesting history that the general public is probably not aware of. Who knew New York, and not Baltimore (in a slave state but that never seceded) and not New Orleans (definitely in a slave state) was the capital of the slave trade from 1850 on to the end of the Civil War. But I wish there had been more on the African side: Who were the slave traders there? How did they capture people who were then enslaved? Was it one ethnic group versus another? All still to be known.