between  1930 and 1940 The broad divisions and social stratifications in the city's structure that had taken shape in the first decades of the century became more evident, with upper classes living in the southern zone of the city, middle classes in the northern part, and low-income populations in the suburbs.

at the same time, The nation was firmly positioned in a phase of democracy, meaning that residents of favelas were able to vote and that the government had to be more wary in its development of policies, as to fairly and positively include all classes.

Published by editora Contraponto in 2005 Favelas Cariocas: 1930 - 1964 (Carioca Favelas 1930 - 1964) by Maria Lais da Silva explores a number of important questions relating to the favelas, such as what relationships existed between these communities and public authorities in the period under question, why these spaces remained and continued to grow despite great resistance to them, and how the real estate boom, industrial development and the national and local landscape affected the way that the question of their existence was addressed.