Question 1
The correct answer is: "factories".
The Rust Belt is the denomination given to a region in the US Midwest, around the Great Lakes, where steel factories and heavy industry plants were located. The region started a deindustrialization process in the decade of the 1980s.
Question 2
The correct answre is: "Europe"
In the European continent, many developed countries have already experienced the deindustrialization process characeterized by the dismantling of heavy industries such as the ones dedicated to steel production (mentioned above) or such as many traditional shipyards. For example, this has happened in Spain, Italy, UK, France, etc.