Here is a Cultural Literacy worksheet on the fall of Rome. This is half-page worksheet that offers the barest of introductions to the topic. Still, it is a good general introduction or a memory-jogger if your students need one.
It might make more interesting–even compelling–reading if one adds the context of, say, news footage of events at the United States capitol on January 6, 2021.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.