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This article is a summary of Alejandro Simonoff´s doctoral thesis. The thesis originated from a number of papers written since the end of the 80s in which a double phenomenon was observed: 1) the existence of political instability which had the consequence of an erratic atttitude to foreign affairs by our country; and, 2) the absence of a proper categorisation of many periods of our present history. The question posed was if this could obey to two reasons or just one of them. In order to solvedoi:10.1590/s1515-33712007000100002 fatcat:y3ytbop4pzgezayocsc6uxyqs4