Economy of South America centuries. This can be explained by South America´s high concentration on primary commodities as well as the state of the educational system and institutional structure, some of which are still related to its colonial past, others to recent political developments. It was only from the 1990s when countries in South America switched over to the system of Free-Market economy. This eventually pulled countries in South America out of the debt crisis. Now, major economic activities include agriculture, industry, forestry, and mining. In 2016, four countries, which include Brazil, Ecuador, Argentina and República Bolivariana de Venezuela experienced decline in output. Other
USS Simon Bolivar (SSBN-641) by her two crews continued until 7 February 1971, when she returned to Newport News for overhaul and conversion of her ballistic missile system to support Poseidon missiles. "Simon Bolivar" departed Newport News on 12 May 1972 for post-overhaul shakedown operations and refresher training for her two crews, which lasted until 16 September 1972. By the end of 1972, she had resumed deterrent patrols while operating from the SSBN refit site in Rota, Spain serviced by submarine tender as part of Submarine Squadron 16. During the summer of 1974, "Simon Bolivar" completed what was to be her final refit at