Why are east afiicane nations promoting the use of the Swahili language?

East African nations are promoting the use of Swahili as a way to foster regional unity and cooperation among the diverse populations in the region. Swahili is a widely spoken language in East Africa and serves as a tool for communication and cultural exchange across borders. By promoting Swahili, these nations aim to strengthen ties with one another and facilitate trade, diplomacy, and social integration.