This dissertation examines how the press and the public opinion were highlighted in the writings of Domingo Faustino Sarmiento. The purpose of this study is to show what was the role of journal in a scene of long civil confronts that marked the territory of Argentina in the first half of the nineteenth century. The main argument is to mark how the media interfered in the affairs of La Plata Region during the administration of Juan Manoel Rosas and the time after his fall, subsequent of the Battle of Caseros. In this scenario, the research also highlights how newspaper became an instrument for progress and civilization, ideals proclaimed by Sarmiento. To perform this study, we analyzed several articles of the author and other texts like Cartas Quillotanas and Las Ciento y Una, that represented one of the most famous controversies of the period fought by Sarmiento and Juan Bautista Alberdi, another great intellectual of generation romantic argentine of 1837.