User:Lka2018/sandbox

Theories on expansion
Linguistically, Bantu languages are categorized as belonging to the Niger-Congo family. Early proto-Bantu languages arose about 5000 years ago in the border area between modern-day Nigeria and Cameroon. Though the languages of the Bantu subfamily are now spoken throughout much of subequatorial Africa, there remains significant controversy regarding how these languages spread from West Africa through most of the subcontinent. Specifically, it is unclear by what routes and mechanisms Bantu languages dispersed.

Evidence derived from multiple disciplines, such as linguistics, archaeology, and genetics, continues to complicate these debates. In particular, the use of archaeological data to support linguistic models led to issues of circular reasoning prior to the 1980s. However, research from various fields may help uncover the complex accounts of the Bantu expansions, with a mixture of different theories potentially proving true in different contexts.

Routes
Two main hypotheses exist regarding the routes by which Bantu languages spread from West Africa. The first is the ‘early split’ or ‘East next to West’ hypothesis, which suggests that the Bantu languages split around 4000 years ago into separate Eastern and Western streams. In this view, the Eastern Bantu stream travelled via savanna habitat north of the equatorial rainforests; the spread did not go through the rainforest. The Western stream moved southward down the western coast of Africa at around the same time, and thus the two groups of Bantu languages diverged.

The second theory is known as the ‘late split’ or ‘East out of West’ hypothesis. This postulates that the Eastern and Western streams were much less definite than supposed by the East next to West model. Rather, Bantu languages as a whole spread southward through the equatorial rainforests, with an eastern stream splitting from the western movement about 2000 years ago. In essence, this hypothesis suggests a main southern/western expansion, with a specified eastern stream branching off.

Vectors of dispersal
Two main hypotheses also exist regarding the mechanisms by which the Bantu languages came to be spoken throughout much of subequatorial Africa. The first credits ‘demic diffusion,’ the movement of people to new regions, with enabling the Bantu expansion. This theory states that Bantu farmers of West Africa spread throughout the subcontinent, colonizing or marginalizing hunter-gatherer cultures along the way. Agriculture promoted population growth, which in turn forced expansion as resources became scarce. The rapid success of these agriculturalist migrations is attributed to the advanced technologies of the Bantu-speaking farmers, specifically those related to food production, pottery, and ironworking. This expansion did not occur as one large migration of Bantu-speaking people. Rather, multiple dispersals, with advances and reversals, may have spread throughout the African subcontinent.

The second hypothesis concerns ‘language shift,’ which refers to the movement of a language as it is assimilated into different communities. In effect, this model suggests that Bantu languages spread due to diffusion through cultures, with little movement of human populations. Historian Jan Vansina has likened this model to the rippling of water after a rock has been thrown in: though the water appears to move as the ripples expand outward, the water molecules in fact stay in place. One mechanism by which language shift may have occurred involves agriculture and trade. The proliferation of farming led to an increase in sedentary lifestyles, which in turn necessitated increased trade for resources. This expansion of trade may have allowed Bantu languages to spread without human population migration. Genetic studies suggest that Bantu expansion through southeastern Africa may have been brought about by language shift rather than the migration of people. Rather than a rapid domination of hunter-gatherer cultures by Bantu agriculturalists, this hypothesis proposes a slower process of language adoption via diffusion by various groups over time.