Serfs/Peasants would live on the protected land of the lord's manor in exchange for food and goods. The serfs/peasants basically fueled the manor and created self sufficiency, to the point where some lords even forbade Serfs/Peasants to leave their estate. Hope this helped you
The Tuskegee Airmen carried an extra burden into battle. They felt that they had to prove that African Americans could fly warplanes successfully against a determined and powerful enemy.