''Homo sapiens'' had first inhabited the country over 200,000 years ago. The Tswana ethnic group were descended mainly from Bantu-speaking tribes who migrated southward of Africa to modern Botswana around 600 AD, living in tribal enclaves as farmers and herders. In 1885, the British colonized the area and declared a protectorate under the name of Bechuanaland. As decolonization occurred, Bechuanaland became an independent Commonwealth republic under its current name on 30 September 1966. Since then, it has been a representative republic, with a consistent record of uninterrupted democratic elections and the lowest perceived corruption ranking in Africa since at least 1998. 