Why are parts of the middle atlantic states called the “rust belt”?

This region received the name Rust Belt in the late 1970s, after a sharp decline in industrial work left many factories abandoned and desolate, causing increased rust from exposure to the elements. It is also referred to as the Manufacturing Belt and the Factory Belt.

моля да ми помогне с английски език аз не разбирам

molya da mi pomogne s angliĭski ezik az ne razbiram

answergeosphere;