Rwanda is a country in central Africa. It is bordered by Uganda, Burundi, Democratic Republic of the Congo and Tanzania. The indigenous population consists of three ethnic groups. The Hutus, who comprise the majority of the population, are farmers of Bantu origin. The Tutsis are a pastoral people who arrived in the area in the 15th century. Until 1959, they formed the dominant caste under a feudal system based on cattleholding. The Twa are thought to be the remnants of the earliest settlers of the region.