Ancient footprints in New Mexico raise questions about when humans inhabited North America

When humans first populated North America and how they arrived has long been a matter of spirited debate. A recent study detailing what archeologists believe are the oldest known footprints in the United States is sparking new questions and upending long-held beliefs. Stephanie Sy reports Stream your PBS favorites with the PBS app: Find more from PBS NewsHour at Subscribe to our YouTube channel: Follow us: Facebook: Twitter: Instagram: