I think it would be climatic changes. After the ice age, lands became a good ground to plant food resources. People learned through experience, observation, and survival the basic things to survive the world and finally stopped in a place and build their own homes and finally settle. They learned that hunting is not enough to sustain their needs so they studied on cultivating their lands to produce their needed food.
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May you please tell me what the options are.
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So then I figure it out and help you better.
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A manor was the Lord's estate. Manors had to be self sufficient because of how dangerous it was to leave them. One way manors were self sufficient is that they had plenty of farms to grow crops. The manor was also self-sufficient because it provided small houses for the serfs.
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