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How do scientist think people first arrived in north america

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After the Ice Age, glaciers melted and people came in small boats. During the Ice Age, people swam across the ocean to follow the mammoths. After the Ice Age, glaciers melted and people crossed land.
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After the Ice Age, glaciers melted and people came in small boats. During the Ice Age, people swam across the ocean to follow the mammoths. After the Ice Age, glaciers melted andpeople crossed land
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