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What period are you talking about? Do these count as “stable political cultures”? [1] [2] [3] [4] [5] [1] https://en.m.wikipedia.org/wiki/Ghana_Empire https:/

• EGreg 7y ago
  “Within two years, Shaka had defeated Zwide at the Battle of Mhlatuze River (1820) and broken up the Ndwandwe alliance, some of whom in turn began a murderous campaign against other Nguni tribes and clans, setting in motion what became known as Defecane or Mfecane, a mass-migration of tribes fleeing the remnants of the Ndwandwe fleeing the Zulu. The death toll has never been satisfactorily determined, but the whole region became nearly depopulated. Normal estimates for the death toll during this period range from 1 million to 2 million people. These numbers are however controversial.[3][4][5][6] By 1825, Shaka had conquered an empire covering an area of around 11,500 square miles (30,000 km2).”