Venezuelan maps mark this region as a ``zona en reclamaciun . Much of Venezuela 's 19th century history was characterized by periods of political instability , dictatorial rule , and revolutionary turbulence . The first half of the 20th century was marked by periods of authoritarianism including dictatorships from 1908 - 1935 (Gen . Juan Vicente Gomez ) and from 1950 - 1958 (Marcos Perez Jiminez . The Venezuelan economy shifted after World War I from a primarily agricultural orientation to an economy centered on petroleum production and export...











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