6. Haiti – Jean-Claude Duvalier
At the age of 19, he assumed the post that was passed down to him by his father, making him the world’s youngest president. The campaign of intimidation and brutality implemented by Jr. Duvalier in Haiti sparked widespread protests. On July 2, 1986, Duvalier departed the country accompanied by his family, but later managed to come back in 2011 following a display of remorse.