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Urbanized area
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A central city plus its contiguous built-up suburbs
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Metropolitan statistical area (MSA)
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In the United States, a central city of at least 50,000 population, the county within which the city is located, and adjacent counties meeting one of several tests indicating a functional connection to the city
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Micropolitan statistical areas
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An urbanized area of between 10,000 and 50,000 inhabitants, the county in which it is found, and adjacent counties tied to the city
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Concentric zone model (Burgess)
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A model of the internal structure of cities in which social groups are spatially arranged in a series of rings
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Sector model (Hoyt)
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A model of the internal structure of cities in which social groups are arranged around a series of sectors, or wedges, radiating out from the central business district
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Multiple nuclei model (Harris and Ullman)
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A model of the internal structure of cities in which social groups are arranged around a collection of nodes of activities
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Census tract
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An area delineated by the U.S. Bureau of the Census for which statistics are published; in urbanized areas, census tracts correspond roughly to neighborhoods
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Squatter settlements
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An area within a city in a less developed country in which people illegally establish residences on land they do not own or rent and erect homemade stuctures
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Filtering
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A process of change in the use of a house, from single-family owner occupancy to abandonment
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Redlining
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A process by which banks draw lines on a map and refuse to lend money to purchase or improve property within the boundaries
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Urban renewal
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Program in which cities identify blighted inner-city neighborhoods, acquire the properties from private owners, relocate the residents and businesses, clear the site, build new roads and utilities, and turn the land over to private developers
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Public housing
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Housing owned by the government; in the U.S., it is rented to residents with low incomes, and the rents are set at 30 percent of the families' incomes
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Gentrification
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A process of converting an urban neighborhood from a predominantly low-income renter-occupied area to a predominantly middle-class and owner-occupied area
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Underclass
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A group in society prevented from participating in the material benefits of a more developed society because of a variety of social and economic characteristics
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Annexation
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Legally adding land area to a ctiy in the United States
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