"Copa 71" tells the story of an international women's soccer competition held in 1971, two decades before FIFA sanctioned an official Women's World Cup. Taking place in Mexico City's massive Azteca stadium, it was the largest live audience for any women's sporting event ever. But it was erased from history. Pure Nonfiction host Thom Powers interviews filmmakers Rachel Ramsay and James Erskine about how they found the participants who waited 50 years to tell their story.

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On Instagram: @purenonfiction @thompowers1