Answer: Cattle herding was part of the economy.
Step-by-step explanation:
The Great Zimbabwe (11th - 15th centuries), whose ruins are the largest in Africa south of the Sahara, were a cattle-herding people, who developed metal-working and had exceptional architectural skill.
The Bunyoro-Kitara were principally cattle herders who developed an empire thanks to their control of a valuable source of salt. Their kingdom rose to dominate the region, with smaller kingdoms around.