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Watch America's Hidden Stories Season 1 Episode 3 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

The flu pandemic of 1918 is the hidden apocalypse of the 20th century, killing as many as 50 million people around the world; with new evidence, scientists investigate the truth behind the so-called Spanish flu to see if it could happen again.