What were the greatest civilizations in America before 15,000 c.e.? What kind of lifestyle was in america during this time? In america there was a great variety of civilizations. Each civilization had its unique properties and other properties were similar. It's still unknown on how did these individuals get to the Americas. Although, there are several amazing theories about how these people got to the americas it is still just suppositions, and they are just proven to be accurate but not true. However…
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