Burundi gained independence in 1962 and initially had a monarchy, but a series of assassinations, coups and a general climate of regional instability culminated in the establishment of a republic and one-party state in 1966. Bouts of ethnic cleansing and ultimately two civil wars and genocides during the 1970s and again in the 1990s resulted in hundreds of thousands of deaths and left the economy undeveloped and the population as one of the world's poorest.