In this article we investigate the political process opened in Argentina after the coup d’état of September 1955 that overthrew President Juan Domingo Perón. In the subsequent de facto government, the sectors that had been displaced from political power since 1946 returned to activity, achieving a new prominence that led to the occupation of key positions in the public administration and in the institutions created within the framework. of the military government. From a comparative perspective we analyze the experience of the political parties Unión Cívica Radical (UCR), Socialist Party (PS), Autonomist Democratic Party (PDA), Progressive Democratic Party (PDP), Liberal Party (PL) and Christian Democratic Party (PDC) in the government of the self-proclaimed Liberating Revolution in the provinces of Corrientes and Chaco. The sources used for this analysis were mainly the written press and official documents.