The best words to use while describing the Paleo-Indian migration are:
They are called hunters and gatherers because they migrated from place to place. They were nomadic people people so such migrations were a part of them. They moved for the sake of food supply.
These hunters and gatherers after they discovered agriculture decided to settle in the Western Hemisphere. After discovering that they could plant and harvest they no longer found the need to move about.
They started build more permanent villages and houses. These people are called the native Americans because they were the first to inhabit this area.
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