20000-30000 years ago - during the last Ice Age - the first humans crossed over the Bering Sea land bridge into the Americas - As they migrated southward - they inhabited the hemisphere from Alaska to Tierra del Fuego - Their widespread dispersion le

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1. 20000-30000 years ago - during the last Ice Age - the first humans crossed over the Bering Sea land bridge into the Americas - As they migrated southward - they inhabited the hemisphere from Alaska to Tierra del Fuego - Their widespread dispersion le