This essay shows an urban and architectural vision of the transformation of Buenos Aires, around the May revolution in 1910. This success marked the highest moment of a transformation process based on the ideas of modernity and progress; clearly stated in the buildings at that time- including the ephemeral buildings raised by the centenary expositions. The placements plans of the commemoratives monuments, in this period, fulfilling the objective of building a national identity trough the conformation of a public imaginary; where founding fathers shared the stage with the symbolic monuments and testimonies gifted by other countries, especially European