What is feudalism?
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the dominant social system in medieval Europe, in which the nobility held lands from the Crown in exchange for military service, and vassals were in turn tenants of the nobles, while the peasants (villeins or serfs) were obliged to live on their lord's land and give him homage, labor, and a share of the produce, notionally in exchange for military protection.

Explanation:

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Dr. King believed in nonviolent protests such as marches, sit-ins, and boycotts. He wanted to have the people on his side when he fought. He appealed to the masses of the public with speeches that were so effective, they are quoted to this day. He used the law and the courts and people to peacefully march towards equality.