ラストベルト
Since the term "Rust Belt" is used to refer to a set of economic and social conditions rather than to an overall geographical region of the United States, the Rust Belt has no precise boundaries. The extent to which a community may have been described as a "Rust Belt city" depends on how great a role industrial manufacturing played in its local economy in the past and how it does now, as well as on perceptions of the economic viability and living standards of the present day.