This is a 24 page slideshow in pdf format. (I also have the identical product in .flp format on this site.) It gives children a basic overview of slavery, the underground railroad, and the Emancipation Proclamation. It also discusses key figures in the Civil Rights movement. This would be appropriate for grades 1-2. The lesson can be spread out over the course of two days (part 1 - slavery and the underground railroad, part 2 - civil rights). The flipchart also includes brief assessment questions at the end of each section to "check what you know".
Key Figures included in flipchart:
Harriet Beecher Stowe
Martin Luther King Jr.