In the mid-19th century, the center of Paris, contrary to popular belief, is not a city of the Middle Ages. Paris has always been rebuilt, but it is true that the growth of the capital's population, in the 18th century and in the first decades of the 19th century, caused a notable densification of the central neighborhoods. A labyrinth of streets that prevents traffic and welcomes more and more inhabitants, and even hygienists will denounce the unhealthy air. According to the ideas of the time, the narrow streets and the height of the houses prevented the circulation of air and the dispersion of "miasmas", which could produce diseases that could lead the individual to death. Therefore, the wealthy classes increasingly tend to leave these areas to settle in the suburbs to the north and west. It is this process of impoverishment of the power station, with the political danger that accompanies it, that will be the basis of the great works undertaken in the 19th century. These observations are not new for the 19th century, and in the 18th century these changes were already considered necessary, the advancement of the transformations of the center of Paris was required by the authorities in search of these minimum needs of hygiene, traffic and space control , starting with the development of the Seine quays and the destruction of the bridge houses during the French Revolution, in 1794, a “commission of artists” implemented a project that proposed new advances in Paris: a straight road would connect Place de la Nation with the colonnade of the Louvre, from the extension of the already existing Victoria Avenue, which will prefigure the future great east-west axis. Furthermore we also have the construction by Nap... in the middle of the paper... apart from this we would have the industrial area and the houses of the workers. However, it is said that Haussman's activities led Paris into greater poverty, putting the citizens in debt, causing a greater need for assistance among the citizens. In the late 1860s the financial system begins to collapse. Expropriations will no longer be so easy and the law will be in favor of the citizen. Jules Ferry will make himself known with his journalistic extracts criticizing all the interventions carried out and the lack of a well-made financial calculation. His famous phrase will be the aforementioned "Haussman's fantastic accounts" which will give the title to his writing Haussman will be removed from office months before the end of the Second Republic, in 1870, and the debt situation in which Paris was immersed will be resolved in the Third Republic..