Answer:
Those who lived on plantations were often far from other houses, let alone towns. Plantations commonly were miles from any other house. Also, those that ran away from the south during the Underground Railroad movement had to be incredibly sneaky to escape, yet were still apprehended typically. A small population in an area, common thinking by those who owned slaves, and a fear of the many brutal punishments in store for those who rebelled all accounted for the lack of uprising.