ARI SHAPIRO, HOST:
Tonight, a new documentary on PBS takes you back to the late 1800s, when eating food in the U.S. meant taking a calculated risk.
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UNIDENTIFIED PERSON: America was the Wild West for putting all kinds of chemicals into food.
SHAPIRO: The country was growing. People were moving into cities, and industrialization gave food producers new, sometimes dangerous, ways to stretch their products.
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