What were there a series of in Haiti in the late 20th Century bringing different leaders to power?

Early History Haiti has a uniquely tragic history. Natural disaster, poverty, racial discord, and political instability have plagued the small history throughout it's history. Before the arrival of European, Arawak (also known as Taino) and Carib Indians inhabited the island of Hispaniola. Although researchers debate the total pre-Columbian population (estimates range from 60,000 to 600,000), the determination impact of colonization is well documented. Disease and brutal labor practices nearly annihilated the Indian population within 50 years of Columbus's arrival.

what are local authorities doing to fix the problem

explanation:

the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.