Swahili City-State Network

Timeline

1. 900–1200Swahili Coast · East AfricaThe fusion of Bantu fishermen and Arab-Persian merchants formed Swahili culture, and a series of Islamized port settlements appeared along the coast; the city-states maintained political independence but formed a loose network through a shared language and trade customs.
2. 1200–1471Kilwa–Mombasa trade belt · TanzaniaIn the 14th and 15th centuries the city-state network reached its height of prosperity; Kilwa controlled the trade of the southern Sofala gold mines, Mombasa and Malindi linked the Red Sea and Indian routes, and the city-states engaged in competition as well as intermarriage and commercial cooperation.
3. 1471–1480Swahili Coast · Swahili CoastIn the 1470s the city-state network still maintained the rhythm of monsoon trade, with port sultans profiting from tariffs and intermediary trade and maintaining close ties with Arab and Gujarati merchants, but European maritime exploration was approaching and the system faced external change.
4. 1480–1515Swahili Coast · East AfricaAfter 1498 the Portuguese gradually occupied key ports such as Kilwa and Mombasa and imposed trade monopolies, breaking the city-states' independent sovereignty and the Indian Ocean free-trade network, ending the era of Swahili city-states as autonomous political-economic units.