The Portuguese intellectual Antonio Sergio (1883-1969) stood out for his cosmopolitan interpretation of Portuguese history, opposing attempts to instrumentalize history in a nationalist way, particularly those who saw Expansion as a virtuous collective action. This article analyzes the beginning of his interpretative work by revisiting the polemic with Jaime Cortesao (circa 1910), to show how Sergio's cosmopolitan path favored the incorporation of critical inspirations from authors of other nationalities, especially his contemporary Brazilian intellectuals, who opposed racial determinism, mixing, like him, pedagogical concerns with those of historical understanding, as well as believing that national ills, largely common because history is common, could be solved through education. These concerns were part of an organicist mind set, tinged with liberal and socialist ide- als, the sociological dimension of which we have highlighted.