Genes.media Sapiens

PEOPLING × LANGUAGE

The Bantu Expansion

~4,400 years ago

History · Bronze Age · Holocene · Northgrippian

From about 4,400 years ago, farming peoples spread from the borderlands of Nigeria and Cameroon through the equatorial forest and beyond, carrying the Bantu languages.

The Bantu expansion designates the dispersal, beginning about 4,400 years ago from the borderlands of present-day Nigeria and Cameroon, of agricultural populations from which more than five hundred Bantu languages derive, spoken today by some 310 million people. The movement crosses the equatorial forest and then continues eastward and southward, with cultivated plants and, subsequently, iron metallurgy. Genetic data restore its route and document admixture with the hunter-gatherer populations encountered, including for genes involved in immunity and lactose digestion.

Four hypotheses for the first migrations of Bantu-speaking peoples. The star marks their starting point, the green area the equatorial forest, and the letters W and E the western and eastern streams. In A, the two streams split early, north of the forest. In B, C and D, they split late, south of it, after crossing it through the Sangha corridor, a gap in the forest (B), along the coast (C) or through its interior (D).
Four hypotheses for the first migrations of Bantu-speaking peoples. The star marks their starting point, the green area the equatorial forest, and the letters W and E the western and eastern streams. In A, the two streams split early, north of the forest. In B, C and D, they split late, south of it, after crossing it through the Sangha corridor, a gap in the forest (B), along the coast (C) or through its interior (D).Koile et al. (2022), PNAS, figure 1, CC BY 4.0

Why it matters

This is one of the most extensive demographic movements in human history, comparable in scale to the Eurasian steppe migrations. It determines the linguistic map of a third of the African continent and, through the Atlantic slave trade, its genetic legacy is present in the Americas, a substantial part of African American ancestry relating to Bantu speakers of western central Africa.

Dating & uncertainty

The itinerary is established from the languages, in two stages: a family tree is constructed from the vocabulary common to the five hundred languages, then each branch is located where its languages are spoken today, the model seeking the geographic route that renders that configuration most probable. The result places the departure about 4,400 years ago and takes the expansion through the equatorial forest rather than around it, prior to the opening of the Sangha corridor. Genetic data concur and specify the order: a common passage through the forest, a late split between western and eastern streams, then rapid progression southward along the Indian Ocean coast, the southern waves continuing into the first millennium CE.

Our species’ history as one day

23:39:5320 min 7 s before midnight

if the 315,000 years of Homo sapiens were compressed into a single day

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