The task fit Portugal to find a form of economic use of the American lands that was not to the easy metal extration. With passing of the years, Brazil colony presented characteristic traces of its agrarian economy, being distinguished it diversity of some economic zones where if it divides the country, precariousness of the small agriculturist/farmer, subordination of the work force and the great agricultural exploration. It is in this context that if had developed what conventionally it is called economic cycles, being distinguished the cycle of the sugar, the coffee, the rubber and ores. One of the main cycles of Brazil and, more specifically of the Amaznia, was the cycle of the rubber (1850-1920). At the beginning of this cycle the investments were made by the inhabitants of the region. The used archaic technology worried and inhibited the foreign investors, mainly the Europe and the United States.
No longer final of the Century it had the formation of great company, financed for foreign capital, intensifying the rubber production. Weinstein Barbarian tells that during most of the decade of 1890, few foreign investors had revealed made use to risk its capital in the land purchase, however for return of the end of the decade many American European firms and north had put of side its restrictions and had started to buy vast properties in the Amaznia. Many problems had been created: agrarian problems, as the property of the land, migration and exploration of the workmanship hand, disrespect to the customs and traditions local and not incentive the workmanship hand. In the height of the expansion of the rubber, Belm was one of the main cities of Latin America. In Brazil, after Rio De Janeiro and of Saints, Belm possua the put into motion port more. With an urban population that if approached to 250 a thousand inhabitants, in 1910, possua an infra structure of country of first world, from there to be known as ' ' The Paris of the Trpicos' ' , however with the collapse of the rubber it lost this superiority and it was also exceeded by other capitals, Manaus, having remained only the good souvenirs of that time.