In spite of regional differences, Eskimo groups are surprisingly uniform in language, physical type, and culture, and, as a group, are distinct in these traits from all neighbors. They speak dialects of the same language, Eskimo, which is a major branch of the Eskimo-Aleut family of languages. Their antiquity is unknown, but genetic testing of ancient human remains in North America that they are relatively recent migrants to the Americas from NE Asia, spreading from west to east beginning about 1,000 years. By about 1300 AD their ancestors, known as the Thule culture, had displaced the earlier inhabitants of North American Arctic. The earlier inhabitants, known as Paleo-Eskimos but genetically unrelated to to modern Eskimos, had first migrated into North America 6,000 years ago.
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