You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "where has the us manufacturing belt been traditionally located (specific cities)?" whose answer is Pittsburgh.
Each document should contain about 30 words, and these documents should contain useful information.

Query: traditional U.S. manufacturing belt cities
Useful Output:

Doc 1: Some major industrial cities of the Rust Belt include Chicago, Baltimore, Pittsburgh, Buffalo, Cleveland, and Detroit.
Doc 2: It's hard to argue that Hamilton and Niagara aren't. In some ways, Chicago and Toronto are the two global cities on the Great Lakes and on the
Doc 3: A century ago, the city of Dayton, Ohio was a center of industry and innovation that supported a prosperous middle class.
Doc 4: The cities included in the rust belt were Pittsburgh, Detroit, and Cleveland, which were hubs for the steel and automotive industries. An image
Doc 5: History of the Rust Belt · Chicago became a hub for freight and passenger train railcars. · Baltimore was known for steel and ship manufacturing.