Through the analysis of selected works for flute by Argentine composers Amancio Alcorta (1805-1862), Alberto Williams (1862-1952) and Ángel Lasala (1914- 2000), the progressive evolution of a Nationalistic style becomes evident. The works of Amancio Alcorta show a strong influence in European Romantic music, while the Sonate Op. 48 by Alberto Williams shows influence of Argentine creole folklore within the European structure. Angel Lasala abandoned the structure of European forms of big scope, typical of the end of the nineteenth century and featured aboriginal elements supported by a simple texture and harmony. Supported by a description of the historic events that led to the ratification of the Argentine Nation, this study connects the development of social stratums, and the relation between racial makeup and its different musical manifestations, with the growth of a National identity and a correspondent musical aesthetic.