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An oligarchy may derive its power from social posi­ tion, wealth, military might or even religion. Most 20thcentury oligarchies have been based on military or po­ litical power. Juntas, small groups of military officers, frequently seized power in Latin America, and a junta ruled Greece from 1967 to 1975. The governments of many communist nations were oligarchies, with politi­ cal control in the hands of a few Communist Party lead­ ers. Many 20th-century oligarchies evolved into dicta­ torships as one member seized power.