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Video: "A Very Short History of Vaccines in America," from PBS
Frontline from PBS published a short video on YouTube about the history of mass immunization in the United States. General George Washington ordered his troops to be inoculated against smallpox, even forcing some of them to get the inoculation (variolation). This assured that the Continental Army would remain smallpox-free at a time when the disease was causing a lot of disease and death, and leading to the defeat of the British troops during the War for Independence.