This document defines key concepts related to the historical and social contexts in Roll of Thunder, Hear My Cry including the Emancipation Proclamation, which freed millions of slaves in 1863, the Fifteenth Amendment in 1870 that prohibited denying voting rights based on race, and the Great Depression of the 1930s when many Americans were unemployed and homeless. It also defines sharecropping, mortgages, prejudice, segregation both de jure and de facto, the "separate but equal" doctrine, and Jim Crow laws that legalized racial segregation in the Southern United States from the 1880s to 1965.