What is a good topic for a 25 page long research paper with 25 sources?

I have to do a research paper that is 25 pages long and requires 25 sources, and only 1 source can be from the internet. I am in need of a topic that there is a lot of material for at libraries. Thanks.
So, my teacher said that it can’t be about a person, so a biography type research paper wont work.

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