The Mfecane (Nguni, Zulu pronunciation: [m̩fɛˈkǀaːne]), also known by the Sesotho names Difaqane or Lifaqane (all meaning "crushing, scattering, forced dispersal, forced migration), is a historical period of heightened military conflict and migration associated with state formation and expansion in Southern Africa. The exact range of dates that comprise the Mfecane varies between sources. At its broadest, the period lasted from the late eighteenth century to the mid-nineteenth century, but scholars often focus on an intensive period from the 1810s to the 1840s. The concept first emerged in the 1830s and blamed the disruption on the actions of Shaka Zulu, who was alleged to have waged near-genocidal wars that depopulated the land and sparked a chain reaction of violence as fleeing groups sought to conquer new lands. Since the latter half of the 20th century, this interpretation has fallen out of favor among scholars due to a lack of historical evidence.
Traditional estimates for the death toll range from 1 million to 2 million; however, these numbers are controversial, and some recent scholars revise the mortality figure significantly downward and attribute the root causes to complex political, economic, and environmental developments. The Mfecane is significant in that it saw the formation of new states, institutions, and ethnic identities in southeastern Africa. The Mfecane's historiography itself is also historically significant, with different versions having been employed to serve a range of political purposes since its inception as a historical concept.
Theories vary as to the causes of the catastrophic warfare and migration of many ethnic groups in the area. Populations had greatly increased in Zululand following the Portuguese introduction of maize from the Americas in the late 17th century, reaching the inland around 1750. While maize was more productive than the grains from native grasses, it required more water during cultivation. The agricultural surpluses and increased population enabled Shaka to field more impis.