<P> The territory of Cuba was inhabited by the Ciboney tribes in the 4th millennium BC . Until the 15th century, it was inhabited by Amerindian tribes which became a colony of Spain until the Spanish--American War of 1898, when Cuba gained nominal independence as a de facto United States protectorate in 1902 . As a fragile republic, Cuba attempted to strengthen its democratic system, but mounting political radicalization and social strife culminated in the dictatorship of Fulgencio Batista in 1952 . Further unrest and instability led to Batista's ousting in January 1959 by the July 26 Movement, which afterwards established communist rule under the leadership of Fidel Castro . Since 1965, the state has been governed by the Communist Party of Cuba . A point of contention during the Cold War between the Soviet Union and the United States, a nuclear war nearly broke out during the Cuban Missile Crisis of 1962 . Cuba is one of the few remaining Marxist--Leninist socialist states, where the role of the vanguard Communist Party is enshrined in the Constitution . Independent observers have accused the Cuban government of numerous human rights abuses, including arbitrary imprisonment . </P> <P> Culturally, Cuba is considered part of Latin America . It is a multiethnic country whose people, culture and customs derive from diverse origins, including the aboriginal Taíno and Ciboney peoples, the long period of Spanish colonialism, the introduction of African slaves, and a close relationship with the Soviet Union in the Cold War . </P> <P> Cuba is a founding member of the UN, G77, NAM, ACP, ALBA, and OAS . The country is one of the world's last planned economies and its economy is dominated by the exports of sugar, tobacco, coffee and skilled labor . According to the Human Development Index, Cuba has high human development and is ranked the eighth highest in North America, though 67th in the world . It also ranks highly in some metrics of national performance, including health care and education, and is the only country in the world to receive WWF's definition of sustainable development . </P> <P> Historians believe the name Cuba comes from the Taíno language, however "its exact derivation (is) unknown". The exact meaning of the name is unclear but it may be translated either as' where fertile land is abundant' (cubao), or' great place' (coabana). Authors who believe that Christopher Columbus was Portuguese state that Cuba was named by Columbus for the town of Cuba in the district of Beja in Portugal . </P>

What are three main sources of income for cuba