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The 18th Amendment (Prohibition Amendment) goes into effect at midnight. Although the law is challenged in some states (New Jersey), the Supreme Court later declares the law valid.
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Station KDKA in Pittsburgh, Pennsylvania, initiates regular radio broadcasts, the first station to do so
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The Emergency Quota Act restricts immigration by setting limits based on the number of foreign-born people already in the country in 1910. Immigration must not exceed three percent of each nationality already in the United States in that year.
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Wage cuts and massive unemployment cause unrest and an increase in violence. The newly formed Hoover Commission suggests price cuts and shorter hours rather than an increase in wages; the average working day is 12-14 hours.
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Margaret Sanger forms the American Birth Control League
