The YouTube page sums this one up nicely, so here ya go:
Everything you are about to see we filmed on a single day in the United States of America. July 4th, 2017.
Over 10,000 people submitted footage of a single day including 92 of our professional crews. They filmed across the country in all fifty states plus Puerto Rico and D.C. and captured a portrait of this country that is absolutely beautiful, challenging and unforgettable.