GENERAL KNOWLEDGE

Detailed explanation-1: -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).

Detailed explanation-2: -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.

Detailed explanation-3: -The land bridge measured about 1, 000 miles north-to-south at its maximum extent. Climate change at the end of the Ice Age caused the glaciers to melt, flooding Beringia about 10, 000 to 11, 000 years ago and closing the land bridge.

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.