Bor became an administrative centre under the Anglo-Egyptian Sudan (1899–1956) for the Dinka people. Bor is the epicenter of the Second Sudanese Civil War. Dr. John Garang De Mabior, an officer in the Sudanese Army led a revolt in the town of Bor, in May 1983, leading to the birth of the Sudan People's Liberation Movement and Sudan People's Liberation Army (SPLM/SPLA). Bor was also the scene of the 1991 Bor massacre, where approximately 2,000 people were killed. Eventually South Sudan became independent on 9 July 2011.