Answer: when large numbers of african born enslaved people were purchased as a group
Explanation: Slave revolts were most likely when slaves outnumbered whites, when masters were absent, during periods of economic distress, and when there was a split within the ruling elite. They were also most common when large numbers of native-born Africans had been brought into an area at one time. Being born free they knew how precious freedom was and how no man should ever own another. Also watch Alex Haley's Roots for the same information and alot of insight into slavery.