USA HISTORY

Detailed explanation-1: -Archaeologists long believed that the first peoples to set foot on this continent arrived by crossing a land connection, the Bering Strait, from Siberia at the end of the last ice age, around 11, 500 to 12, 000 years ago.

Detailed explanation-2: -In the 1970s, college students in archaeology such as myself learned that the first human beings to arrive in North America had come over a land bridge from Asia and Siberia approximately 13, 000 to 13, 500 years ago. These people, the first North Americans, were known collectively as Clovis people.

Detailed explanation-3: -Now our understanding of when people reached the Americas-and where they came from-is expanding dramatically. The emerging picture suggests that humans may have arrived in North America at least 20, 000 years ago-some 5, 000 years earlier than has been commonly believed.

Detailed explanation-4: -The settlement of the Americas began when Paleolithic hunter-gatherers entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the Last Glacial Maximum (26, 000 to 19, 000 years ago).