The acclaimed documentarian’s latest epic series has been in the works for a decade and features A-list contributions from Meryl Streep to Tom Hanks

Ken Burns is no longer a mere documentarian; he is a brand, a franchise, a one-man industrial complex. When he has a new project heading for the small screen, everybody wants a part of him.

Burns has done “more fucking podcasts than I ever thought possible”, he says, nearing the end of nine-month promotional tour that included 40 cities, 80 screenings and hundreds of interviews. “I think there are 340.1m podcasts, one for every American, and I’ve done half of them.”