I present the main results of the LHEAf project, www.lheaf.org on this topic arguing 1. South Cushitic is not part of East Cushitic, 2. Proto Tanzanian Cushitic is influenced by Oromo in Kenya, 3. Taita Cushitic is South Cushitic, 4. (Tanzanian) South Cushitic and South Nilotic / Datooga were in contact. On the basis of the linguistic history I discuss possible places and history of people. Note: This talk has not gone through a process of peer review, and findings should therefore be treated as preliminary and subject to change. Acknowledgement and citation: Mous, Maarten. 2024. Tanzanian Cushitic History. Talk given at The Rift Valley Network Webinar Series. 01/05/2024.