I've seen this question before...it's D. Elderly
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a decrease in manufacturing.
What is Rust Belt?
The geographical area that stretches from New York through the Midwest and was formerly dominated by the coal industry, steel production, and manufacturing is referred to as the "rust belt" in colloquial language. Due to its closeness to the Great Lakes, canals, and rivers, which allowed businesses to get raw materials and ship out finished goods, the Rust Belt developed into an industrial hub.
After a dramatic decline in industrial production left many factories empty and forlorn, increasing rust from exposure to the elements, the area was given the nickname "Rust Belt" in the late 1970s. It is also known as the Factory Belt and the Manufacturing Belt.
Learn more about Rust Belt with the help of given link:-
brainly.com/question/14680506
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Manifest Destiny
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