Final answer:
Sub-Saharan Africa did centralize power under various large states and kingdoms, the earliest plant domestication likely includes the Southeastern United States, and Great Zimbabwe was not a West African empire.
Step-by-step explanation:
The statement that Sub-Saharan Africa did not centralize power under one leader or central government is False. The continent of Africa featured several large, centralized states and kingdoms such as the powerful trade-based empires of Ghana, Mali, and Songhai in West Africa. For instance, Songhai was considered to be the largest and most powerful during the sixteenth century until its defeat by the Moroccan army at the Battle of Tondibi in 1591, which led to its dramatic fragmentation.
Regarding the independent centers for plant domestication, the claim that the region of the present-day Southeastern United States was likely one of these centers is True.