ホワイト・フライト
Urban decay is the sociological process whereby a city, or part of a city, falls into disrepair and decrepitude. Its characteristics are depopulation, economic restructuring, abandoned buildings, high local unemployment (and thus poverty), fragmented families, political disenfranchisement, crime, and a desolate, inhospitable city landscape. White flight contributed to the draining of cities' tax bases when middle-class people left. Abandoned properties attracted criminals and street gangs, contributing to crime.