What is interesting is how SA history is being rewritten.
I was taught about the Mfecane and Defecane in history at school and how this left the vacuum for the great trek. Now this is being rewritten
During the last half of the eighteenth century and the first quarter of the nineteenth, dramatic developments transformed the nature of African societies, and altered the demographic shape of South Africa. These have been referred to as the Mfecane (for Nguni speakers) and Difaqane (for Sotho-Tswana speakers) on the highveld. Before the 1970s, scholars generally thought that these changes derived from the growth of the Zulu kingdom under Shaka in southeast Africa, and that the changes had begun to occur at the end of the eighteenth century. Since the early 1990s such views have been modified. It is now accepted that the Zulu were by no means the only ones responsible for the warfare that spread throughout the southeast African coastal areas and the inland regions.

Now it is generally recognised that other African chiefdoms responded just as vigorously and innovatively to the changing conditions of the late eighteenth century. The geographic focus of the process has been expanded to include the interior of South Africa, and the beginning of the Mfecane has been extended backwards from about the 1790s to the mid-eighteenth century. Geographically, the sphere of the Mfecane has now been broadened to include communities of the entire western highveld. Link
So history is being rewritten in the eyes of our present situation this is quite a process to watch and makes you think about how slanted history is!