Prehistoric People of North America Author:Diana Childress Millions of years ago, giant sheets of thick ice covered most of the earth , lowering ocean levels and exposing large portions of land. Across a stretch of land that connected Asia to North America, bands pf hunters migrated in search of food. When the ice melted after thousands of years, the link to Asia disappeared, but the hunters had long ... more »since settled in the new region. They were the first Americans - known as the Paleo-Indians.« less