is socio-economically connected to the urban core city, typically by employment ties through commuting, with the urban core city being the primary labor. Retrieved "Estimativas da populaço residente no Brasil e Unidades da Federaço com data de referência em 1 de julho de 2017" (PDF) (in Portuguese). 73 About 82 percent of the population of the United States lives within the boundaries of an urbanized area as of December, 2010. Statistics Canada, May 5, 2011. Singapore has a highly centralised, unitary government with a unicameral legislature (the City Council and the Rural Board were abolished in the 1960s).