How Long Have Humans Lived in North America? | Ice Age Footprints

Learn how ancient human footprints preserved in White Sands National Park in New Mexico may provide clues to when humans first arrived in North America in these videos from NOVA: Ice Age Footprints. Use this resource to demonstrate the use of both stratigraphy and radiocarbon dating to collect evidence of the age of a past event and how new scientific data can challenge prior understandings.