"Exactly when the first group of people migrated into the America's is subject to much debate. Recent archaeological finds suggest multiple waves of migration, some of which may have taken place as early as 40,000 BC. All theories agree that the Inuit and related peoples arrived separately and at a much later date, probably around the 6th century, moving across the glaciers from Siberia into Canada.
It is generally believed that the North American continent received the first people, Asian nomads who crossed the Bering Land Bridge. For many years, scientists accepted that the earliest people were of the Clovis culture, with sites dating from some 13,500 years ago. Older sites occupied up to 20,000 years ago are still not widely accepted, although they are supported by recent DNA evidence. By 10,000 BC, humans are thought to have reached Cape Horn, at the southern tip of South America. Artifacts have been found in both North and South America which have been dated to about 10,000 BC.  
Other groups have additional beliefs about ancient visitors to the Americas. For example, the Book of Mormon, a religious text used by The Church of Jesus Christ of Latter-day Saints and other denominations within the Latter Day Saint movement, follows a family of Israelites who set out for the "promised land" about 600 BC. This text records their arrival in the Americas and information on resulting cultures and civilizations."