Urban decay

A ghetto is a part of a city in which members of a minority group are concentrated, especially as a result of political, social, legal, religious, environmental or economic pressure. Ghettos are often known for being more impoverished than other areas of the city. Versions of such restricted areas have been found across the world, each with their own names, classifications, and groupings of people.

A slum is a derogatory term for a highly populated urban residential area consisting of densely packed housing units of weak build quality and often associated with poverty. The infrastructure in slums is often deteriorated or incomplete, and they are primarily inhabited by impoverished people.

separation of humans based on race

city depopulated of inhabitants and that often stays practically intact

thumb|upright|The international squatters' symbol Squatting is the action of occupying an abandoned or unoccupied area of land or a building (usually residential) that the squatter does not own, rent or otherwise have lawful permission to use. Squatting typically occurs when people find empty buildings or land to occupy for housing.

historical period

thumb|A Street fighting|street level rumble of Apache gang members battling Parisian Police officers en masse on 14 August 1904 A gang is a group or society of associates, friends, or members of a family with a defined leadership and internal organization that identifies with or claims control over territory in a community and engages, either individually or collectively, in illegal, and possibly violent, behavior, with such behavior often constituting a form of organized crime.

form of social disadvantage and relegation to the fringe of society

environmental injustice that occurs within a racialized context both in practice and policy.

thumb|Bethlehem Steel in Bethlehem, [[Pennsylvania, one of the world's leading steel manufacturers for most of the 20th century, discontinued most of its operations in 1982, filed for bankruptcy in 2001, and was dissolved in 2003.]] Deindustrialization is a process of social and economic change caused by the removal or reduction of industrial capacity or activity in a country or region, especially of heavy industry or manufacturing industry.

depopulation in humans is any great reduction in a human population caused by events such as long-term demographic trends

criminological theory

exploration of usually hidden or abandoned structures

sociological process affecting cities

relinquishment under law

vicious cycle that reinforces poverty

thumb|A suburban land use planning|land use pattern in the United States ([[Colorado Springs, Colorado), showing a mix of residential streets and cul-de-sacs intersected by a four-lane road.]]

Counterurbanization, ruralization, or deurbanization is a demographic and social process in which people move from urban areas to rural areas. It, as suburbanization, is inversely related to urbanization, and first occurs as a reaction to inner-city deprivation. Recent research has documented the social and political drivers of counterurbanization and its impacts in China and other developing countries which are undergoing a process of mass urbanization. Counterurbanization is one of the causes that can lead to shrinking cities.

previous industrial or commercial land, often somewhat contaminated as a result

2008 American apocalyptic television series

thumb|House in Salinas, California, under foreclosure, following the bursting of the [[2000s United States housing bubble.]]

shopping center with low occupancy

area that has limited access to affordable and nutritious food

period in the history of the Byzantine Empire, during the 7th and 8th centuries

Declinism is the belief that a society or institution is tending towards decline. Particularly, it is the predisposition, caused by cognitive biases such as rosy retrospection, to view the past more favourably and the future more negatively.

community that is no longer covered by daily newspapers

economic term for a person who owns and rents out a profit-earning property

central area of a major city or metropolis, social term

positive and negative impacts of cars on society

thumb|Bunks in a Seven Cent Lodging House, A flophouse (American English) or doss-house (British English) is a place that has very low-cost lodging, providing space to sleep and minimal amenities.

agricultural, landscaped, or natural land

dense city that has experienced notable population loss

Previously inhabited areas reclaimed by vegetation and wildlife

theory asserts that taxation and welfare systems can jointly contribute to keep people on social insurance

social group-based killing that consists of the elimination of members of society who are considered undesirable, including the homeless, criminals, street children, the elderly, the poor, the weak, the sick, the needy, the disabled

vacant urban land teeming with vegetation

thumb|An abandoned building in Washington, D.C. being converted into luxury condominiums

ruins of architecture constructed in the recent past

building where drug dealers and drug users buy, sell, produce, and use illegal drugs, including crack cocaine