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 longheld 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: