Federalists, who supported the view of Argentina as a confederation of self-ruled provincial states, fought Unitarians, who wanted a national government centralized in and controlled from Buenos Aires.
Lagos worked as a clerk and then as a typographist in a state printing press, under the government of Juan Manuel de Rosas.
President Urquiza, interviewed by Lagos, sponsored the idea and provided funding for a newspaper to advocate this cause in Rosario.
Lagos defended his political convictions vehemently, which caused La Capital to be shut down by the authorities on several occasions.
In Rosario, now a major urban center, Lagos is acknowledged as a champion of the cause of federalism and against the concentration of political power in Buenos Aires.