 The city grew that way, but going back a bit in history, one can not forget the importance of Amerindians in the ethnic contribution.It was the Amerindians who began human occupation in the Amazon, and their descendants, the caboclos, developed in intimate contact with the environment, adapting to the regional peculiarities and opportunities offered by the forest.In historical formation, Itacoatiara's demography is the result of the miscegenation of the three basic ethnic groups that compose the Brazilian population