Here is a Cultural Literacy worksheet on Liberia. This is a full-page worksheet with a three-sentence reading with six comprehension questions. This is probably suitable as an independent practice assignment (aka homework). My own sense is that the history of racism in the United States warrants a deeper, more critical look at the motivations of the American Colonization Society in encouraging freed slaves to migrate to Africa.
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.