This dissertation proposed to study the journal of the Instituto Histórico e Geográfico Brasileiro published after the end of the war in the Paraguay until the proclamation of the Republic, resulting, among other points, in a reflection on the historical time, outline of an extension and of an intensity, particular to the texts and authors published in this journal. Since such texts and authors used to comment a new era of the IHGB and of the Empire, they delimited a period that had began with the participation of the Emperor in a session of the Institute (one of the confirmations of the successes of the majority). The commitment with the Emperor, and with the order that he symbolized, appears when the members of the Instituto Histórico defended the widening of this period. Consequently, they were faithful to an assembly of previous debates that treated specially of borders and nations, whereas, on the outside of the Institute, the Republic was being consented. Threfore, we discussed specially these texts and authors (as the Viscount of Taunay and Couto of Magalhães) that shaped borders and nations, in a debate where the attention to the territory overlapped with an argument about his habitants (the wild). In the moment that they lost the Emperor and a part of these debates lost force, the members of the IHGB reaffirmed the commitment with the reason and the distance of the world of the passions that, second then own, marked the regency and marked this new present. They were, finally, heirs still committed to give continuity to the Instituto Histórico, Institute of wise man committed with the progress of the Nation.