Approximate date of the origins of human life in the Western Hemisphere?

The origins of human life in the Western Hemisphere are estimated to date back at least 15,000 to 20,000 years ago, with some evidence suggesting even earlier habitation. Archaeological findings, such as those at Monte Verde in Chile, indicate that humans may have arrived via the Bering Land Bridge during periods of lower sea levels. These early inhabitants are believed to have migrated southward across North America into Central and South America over thousands of years.