The mainstream scientific theory that North and South America's indigenous cultures came across the Bering land bridge from Asia at the end of the last ice age appears to be in jeopardy, with the growing acceptance of archaeological finds across the two continents that point to a much earlier period of habitation. A recent paper published regarding an underwater sinkhole in Florida that contains human-made artifacts dating back to 14,550 years ago -- over a thousand years before humans were even supposed to be in Alaska -- is one such example, although the acceptance of these ideas has been slow.
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