Which was earlier developed as a rubber - collecting centre but it is now a popular port
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The Amazon Rubber Boom (Portuguese: Ciclo da borracha [ˈsiklu dɐ buˈʁaʃɐ], 1879 to 1912) was an important part of the economic and social history of Brazil and Amazonian regions of neighboring countries, being related to the extraction and commercialization of rubber. Centered in the Amazon Basin, the boom resulted in a large expansion of European colonization in the area, attracting immigrant workers, generating wealth, causing cultural and social transformations, and wreaking havoc upon indigenous societies. It encouraged the growth of cities such as Manaus and Belém, capitals within the respective Brazilian states of Amazonas and Pará, among many other cities throughout the region like Itacoatiara, Rio Branco, Eirunepé, Marabá, Cruzeiro do Sul and Altamira; as well as the expansion of Iquitos in Peru and Cobija in Bolivia. The rubber boom occurred largely between 1879 and 1912. There was heightened rubber production and associated activities again from 1942 to 1945 during the Second World War.