Nguni-speaking chiefdoms (Rharhabe, Gcaleka, and related houses) of the southeastern Cape frontier; never unified into a single kingdom, but a major political-cultural bloc whose Cape Frontier Wars with the Dutch/British began in 1779, squarely in this era.
Not an ending: the Xhosa remain one of South Africa’s largest nations. The map hands off to the Cape Colony’s eastward expansion and, from 1961, South Africa.
The definitive scholarly history of the pre-colonial Xhosa chiefdoms through the Cape Frontier Wars era; verified via Open Library (also a 2007 reprint edition).