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Friday, March 20, 2026

Line for March 20, 2026

Put these 5 milestones in time order, earliest at the top. The years appear when you lock in your order.

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Earliest

  1. 1
    Eradication smallpox

    The last known natural smallpox case, in Somalia

  2. 2
    Vaccine chickenpox

    The chickenpox (varicella) vaccine is licensed in the U.S.

  3. 3
    Campaign measles

    Measles becomes a disease U.S. doctors and labs must report

  4. 4
    Campaign tuberculosis

    March 24 is recognized as World TB Day, a century after Koch

  5. 5
    Eradication smallpox

    The World Health Assembly declares the world free of smallpox

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