Here are the correct answers to your questions about the feudal system:
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What was the main idea behind the feudal system?
- Exchange of land and services
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Who did most of the land in the kingdom belong to under the feudal system?
- King
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What term was used to describe someone who received land from a lord?
- Vassal
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In what way did feudal relationships differ from the representation of a pyramid?
- Both vertical and horizontal ties
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What were vassals expected to provide their overlords by the later middle ages?
- Military support
Let me know if you need further information!