A combination of local factors--population growth, the depletion of natural resources, and devastating drought and famine--led to revolutionary changes in the political, economic, and social structure of Bantu-speaking communities in southern Africa in the first half of the nineteenth century. Thousands of people died because of ecological catastrophe and warfare; thousands more were displaced. Large centralized states of tens of thousands of people with standing armies of up to 40,000 men and autocratic leaders emerged where before there had been only small-scale political entities and no chief had had total power. This period of revolutionary change--known as the mfecane (or crushing--see Glossary) by the Zulu and the difaqane (see Glossary) by the Sotho--is also often referred to as "the time of troubles" (see fig. 5).

The causes of the mfecane were emerging by the end of the eighteenth century, when population levels increased rapidly, and ecological resources were sometimes scarce. Communities that previously had often spread across the countryside or had repeatedly divided and moved along the frontier became more settled and more concentrated. The introduction of corn from the Americas through the Portuguese in Mozambique was one major reason for this trend. Corn produced more food than indigenous grasses on the same land, and thus could sustain a larger population. Trade in ivory with the Portuguese in Delagoa Bay was another factor that induced people to settle just south of Mozambique. Moreover, possibilities for population movement had become much more limited by the end of the eighteenth century because land was in short supply. Bantu-speaking farmers had reached the margins of arable land on the edge of the Kalahari Desert in the northwest and in the mountains on the southern border of the Highveld, and people settling in the area found their access to water more and more limited.

Declining rainfall in the last decades of the eighteenth century, followed by a calamitous ten-year drought that began about 1800, caused massive disruption and suffering. The adoption of corn as a major staple gave this drought an even greater impact than those of the past because corn needed much more water than local grains in order to produce. When the rains failed, therefore, the effect was devastating. People fought one another for meager supplies of grain and cattle, hunted down whatever game they could find, and sought out any remaining water supplies in a desperate attempt to survive. Warfare erupted, and two kingdoms--the Ndwandwe under the leadership of Zwide, and the Mthethwa under Dingiswayo--battled for control of resources. Both kingdoms became more centralized and militarized, their young men banded together in age regiments that became the basis for standing armies, and their kings became more autocratic as they fought for survival. The Ndwandwe appeared victorious in 1818 when Dingiswayo was killed and his forces scattered, but they were soon overcome by Shaka, founder of the Zulu state.

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Source: U.S. Library of Congress