This is very obviously your homework for AP Euro History. Finding this out is even easier when you're on a day-old account, but we can generally tell just from the question style.

While these posts are allowed you should review the rules on what response you might receive. I can't speak for everyone on Reddit but I know by-and-large the majority of flairs won't want to do your homework for you.

If there are issues you don't understand or need clarification then ask them in a separate question and people will try and explain them to you (if they have time).

Notwithstanding the fact that this is a homework question, there are some excellent books if you're genuinely curious. Barbara Tuchman's "Distant Mirror" has a particularly gut wrenching (but entirely factual) chapter on the plague. I'm sure it's in your high school library. For fiction there's Iain Pears's Dream of Scipio, Connie Willis's Doomsday Book, and the Pillars of the Earth and World Without End series. These are necessarily not factual -- though Pears is pretty credible and a fantastic writer -- but they're very interesting takes worth examining.

Like others said, this is a HW/DBQ. Are you familiar with the Internet History Sourcebook? You'll find a lot of documents there.