The urban structure of today's Brazil was dictated by colonizers' politics. 
				 Their only interest in overseas trading ended at the coast by creating harbour cities.
				 
					In the beginning of the 20th century Rio had become Brazil’s industrial 
					centre and its first city to suffer from migration.
          
					
					The first wave, caused mainly by attractive salaries in the city, attracted rural population 
					from Guanabara, whose descendants make up 50 percent of today’s favelas. The rural exodus was
					 so intense that Rio's population doubled from 1930 within 5 years to 2.38 million.
          
					In 1940, the second wave arrived from neighbouring states Espirito-Santo 
					and Minas-Gerais. In 1960, the road from Salvador de Bahia to Rio de Janeiro 
					was built, a call to the south, the land of industries and workplaces. Consequently 
					the way to Rio has gotten easier and faster so that not only the coastal but also the 
					western population (tormented by drought) followed the call, forming the third wave.
          
43 percent of industries are located in the states of Rio de Janeiro, Minas-Gerais and Espirito-Santo.
These three waves are typical for rural exodus, since the rural population has no possession.
Two percent of the population possess 60 percent of Brazilian land.
					
          The rural population is dependent on large landed proprietors, who are recruiting farm 
					labourers on an as-needed basis and only for room and board. This makes it impossible for 
					them to emancipate themselves, except by emigration to the city. This is especially true when 
					prospects for work are next to nothing during periods of drought.
In the city 64,7% of labourers are earning more than minimum wage; in the countryside, only 14,9 %.The image of the heavenly south has been created by industrial magnates and by rural migrants to the city themselves.
This excessive growth rate was never noticed until now, since the infant mortality rate in the countryside was a lot higher than in the city.
These four waves had been observed; but no reactions were observed. So Rio's population grew and grew. Even today the problem has yet to be resolved.
Favela
        These are highly consolidated residential self-construction on
        invaded public and private land and without infrastructure. These
        exist in large numbers all over Rio.
        UN habitat
Favela ist ein unübersetzbares brasilianisches Wort. Man
        könnte es einfach als Synonym für Armut und Elend
        setzen, aber ein brasilianisches Wörterbuch der
        portugiesischen Sprache definiert es folgendermaßen:
        Bezeichnung eines Hügels in Rio de Janeiro, Zuflucht der
        Armut, der Gaunerei, des Nichtstuns und des Streites, eine Art
        „Cour de Miracles“ von Paris. Es bedeutet ein Gebiet
        des sozialen Verfalls, der fehlenden Anpassung und der
        Zersplitterung.
        1987 Vorwort von Audálio Dantas zu Carolina
        Maria de Jesus Tagebuch der Armut
Didier Drummond Architectes des favelas, Bordas, Paris 1981