What did the peasants/serfs get in return for providing food to the knights and nobles/vassals?

Economic sanctions are mainly used to protect domestic industries from international competitors. domestic industries gain more business. punish nations for disobeying international law. encourage nations to give up their nuclear weapons.

What might be something all americans believe in that unite us as a nation ?

•the impact of enlightenment ideals on the development of economic, political, and religious structures in the western world