of Brazil, arrived in Rio de Janeiro in search of work and settled in Duque de Caxias. The executive power was officially installed on 1 January 1944. After the military dictatorship, a great deal of political, business, trade union, and community leadership, the municipality gained its autonomy in 1985. Geography The municipality is limited to the north with Petrópolis and Miguel Pereira, to the east, the Bay of Guanabara and Magé, to the south, with the city of Rio de Janeiro, and in the west, with São João do Meriti, Belford Roxo and Nova Iguaçu. Caxias has a hot climate, however, the 3rd and 4th districts (Imbariê and Xerém) are warm because of the green area and the proximity to the Serra dos Órgãos. The municipality contains part of the Tinguá Biological Reserve, a strictly protected Atlantic Forest conservation unit created in 1989. It contains the Taquara Municipal Nature Park, visited by up to 4,000 people per month in the summer. It also contains part of the Central Rio de Janeiro Atlantic Forest Mosaic, created in 2006. The Meriti River separates Duque de Caxias from Rio de Janeiro city. The Rio Iguaçu separates Duque de Caxias and Nova Iguaçu city. The Rio Sarapuí is the division between the 1st and 2nd districts, and Saracuruna River is the division between the 2nd of the 3rd districts. Demographics The population of Duque de Caxias is 873,921, up from the 785,041 in 1960. The city is not used to have an expressive index of growing population since it was founded. According to 2010 census, whites were 29.5%, brown (mulato and mixed races) were 58.8% and black people were representing 11.5%. Other races were representing 0.2% of population. Economy Economically, shows great growth in recent years, with the main industry and trade activities. There are about 809 industries and 10 thousand shops installed in the city. According to the IBGE, the municipality of Duque de Caxias registered in 2005, the 15th largest GDP in the national ranking [5] and the second largest in the state of Rio de Janeiro, in a total of 18.3 billion reais. [4] A City ranks second in the ranking of revenues of the state ICMS, losing only to capital. No the municipality is located one of the largest refineries of Petrobras, the reduction, has a gas-chemical pole, with one thermoelectric plant. The main industries are: chemical, petrochemical, metallurgy, gas,