Don Tate's The Remarkable Story of George Moses Horton tells about a young man who loved learning but wasn't given opportunities or time for education because he was born a slave. Through persistence, creativity, and hard work, George was able to learn quite a lot, and in the end, he gained his freedom as well.
You can craft a whole lesson around or unit around George Moses Horton's story, or you can just read it and let your kids explore the Follow-Up while you get some of your own work done.
Don't forget to check out Don Tate's website. He has some fantastic downloadable activities and discussion guides, and you can see slideshows of some of his artwork--he's very prolific!