I serendipitously came across this today:

Entwined African and Asian genetic roots of medieval peoples of the Swahili coast https://www.nature.com/articles/s41586-023-05754-w

"A key finding of this study is evidence of mixture at roughly AD 1000 between peoples of African and Persian ancestries [...]

This is consistent with the Kilwa Chronicle, which describes the arrival of Persians on the Swahili coast and interactions between them and coastal residents. Whether or not this history has a basis in an actual voyage, the ancient DNA provides direct evidence for Persian-associated ancestry being derived overwhelmingly from males and arriving on the eastern African coast by about AD 1000

This timing coincides with archaeological evidence for a substantial cultural transformation on the coast, including the widespread adoption of Islam [...]

Persian loanwords contribute up to 3% of Kiswahili, but it is unclear whether they are derived directly from Persian or through adoption into other Indian Ocean languages"

I am an East-African and this article does not provide the key reasons why Swahili is an important part of East-Africa and which often requires understanding of its history. Tanzania only adopted swahili post-colonial, but the language has flourished along the east-african coast (Mogandishu in present day somalia to Mozambique) for millennia as the glue language of trade. Kenyan coast (Lamu and Mombasa) played an instrumental role in the adoption of the language. Swahili itself is a fusion of bantu,arabic and borrowed some of the works from portuguese (Pesa- peso, Meza- Mezzo) and many others. As a core bantu language, it can be easily understood and adopted across the bantu lands of East, Central and South-africa. These elements are what makes it such a great language for the region. Trying to cement Tanzania as the core reason for the language success is short-sighted.

Thanks for sharing this! I found it insightful - especially for the role Nyerere played. Ahsante!

Lol idk if the site is down or if the content is geoblocked. I'm in Nairobi, Kenya and I can't access the article lmao