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In page Timeline of African-American history:

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1923

  • Garrett A. Morgan invented and patented the first automatic three-position traffic light.[7]
  • January 1–7 – Rosewood massacre: Six African Americans and two whites die in a week of violence when a white woman in Rosewood, Florida, claims she was beaten and raped by a black man.[citation needed]
  • February 19 – In Moore v. Dempsey, the U.S. Supreme Court holds that mob-dominated trials violate the Due Process Clause of the Fourteenth Amendment.[citation needed]