USA HISTORY

Detailed explanation-1: -"According to the Land Bridge Theory, Native Americans migrated from Asia to North America across a land bridge that formed during the Ice Age."

Detailed explanation-2: -The land beneath the Bering Strait became exposed and a flat grassy treeless plain emerged connecting Asia to North America. This exposed land stretched one thousand miles from north to south.

Detailed explanation-3: -Scientists one theorized that the ancestors of today’s Native Americans reached North America by walking across this land bridge and made their way southward by following passages in the ice as they searched for food. New evidence shows that some may have arrived by boat, following ancient coastlines.

Detailed explanation-4: -As of 2008, genetic findings suggest that a single population of modern humans migrated from southern Siberia toward the land mass known as the Bering Land Bridge as early as 30, 000 years ago, and crossed over to the Americas by 16, 500 years ago.

Detailed explanation-5: -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).