The first known inhabitants of modern-day United States territory are believed to have arrived over a period of several thousand years beginning sometime prior to 15,000 - 50,000 years ago by crossing Beringia into Alaska.[2] [3] Solid evidence of these cultures settling in what would become the US is dated to at least 14,000 years ago.[4]
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The Adenans were the first group of Indians or Native Americans who built mounds in America. The mounds were burial sites for their dead.
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The Louisiana purchase
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