October 2016, Burundi informed the UN of its intention to withdraw from the International Criminal Court. Burundi remains primarily a rural society, with just 13.4% of the population living in urban areas in 2019. The population density of around 315 people per square kilometre (753 per sq mi) is the second highest in Sub-Saharan Africa. Roughly 85% of the population are of Hutu ethnic origin, 15% are Tutsi, and fewer than 1% are indigenous Twa. The official languages of Burundi are Kirundi, French, and English, Kirundi being recognised officially as the sole national language. One of the smallest countries in Africa, Burundi's land is used mostly for subsistence agriculture and grazing, which has led to deforestation, soil erosion and habitat loss. , the country was almost completely deforested, with less than 6% of its land covered by trees and over half of that being commercial plantations. Burundi is the poorest country in the world according to gross domestic product (GDP) per capita, with $292 in 2022, and a least developed country, facing widespread poverty, corruption, instability, authoritarianism, and illiteracy. Burundi is densely populated, and many young people emigrate in search of opportunities elsewhere. The World Happiness Report 2018 ranked the country as the world's least happy with a rank of 156. Burundi is a member of the African Union, Common Market for Eastern and Southern Africa, United Nations and the Non-Aligned Movement. Etymology Modern Burundi is named after the King of Burundi, who ruled the region starting in the 16th century. It may ultimately derive its name from the Ha people of the region, whose place of origin was known as Buha. History Burundi is one of the few countries in Sub-Saharan Africa, along with its neighbour Rwanda among others (such as Botswana, Lesotho, and Eswatini), to be a direct territorial continuation of a pre-colonial era African state. The early history of Burundi, and especially the role and nature of the country's three dominant ethnic groups, the Twa, Hutu and Tutsi, is highly debated amongst academics. However, it is important to note that the nature of culture and ethnic groups is always fluid and changing. While populations might have migrated to the area at different times and as distinctly different ethnic groups, the current distinctions are considered by some to be socio-cultural constructs. Initially the different ethnic groups lived together in relative peace. The first conflicts between ethnic groups can