 Rwanda has been governed as a unitary presidential system with a bicameral parliament ruled by the Rwandan Patriotic Front since 1994.The country is member of the African Union, the United Nations, the Commonwealth of Nations, COMESA, OIF and the East African Community.Modern human settlement of what is now Rwanda dates from, at the latest, the last glacial period, either in the Neolithic period around 8000 BC, or in the long humid period which followed, up to around 3000 BC.