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In page History of Portugal:

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There are few global and up-to-date studies of this turbulent third phase of the Republic's existence.[2][3][4] Nevertheless, much has been written about the crisis and fall of the regime and the 28 May movement.[5][6][7][8][9][10] The First Republic continues to be the subject of an intense debate. A historiographical balance sheet by Armando Malheiro da Silva (2000) identifies three main interpretations. For some historians the First Republic was a progressive and increasingly democratic regime. For others it was essentially a prolongation of the liberal and elitist regimes of the 19th century. A third group chooses to highlight the regime's revolutionary, Jacobin and dictatorial nature.[citation needed]