Define Pre-Columbian time in American history?

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1. Guest270
   

   According to the still debated Settlement of the Americas, a migration of humans from Eurasia to the Americas took place via Beringia, a land bridge which formerly connected the two continents across what is now the Bering Strait. Falling sea levels created the Bering land bridge that joined Siberia to Alaska, which began about 60,000 – 25,000 years ago.The minimum time depth by which this migration had taken place is confirmed at 12,000 years ago, with the upper bound (or earliest period) remaining a matter of some unresolved contention.These early Paleoamericans soon spread throughout the Americas, diversifying into many hundreds of culturally distinct nations and tribes.The North American climate finally stabilized by 8000 BCE; climatic conditions were very similar to today's.This led to widespread migration, cultivation  of crops, and subsequently a dramatic rise in population all over the Americas.

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