Major American cities with black, female mayors:
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San Francisco, CA - London Breed
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I am not claiming either cause or effect here, but how are those cities doing, in terms of jobs, crime, education, and citizen health?
Charlotte is quite certainly the best... and it ain't that great.
SF's problems with crime, bum-crap, bum-used-needles, and bum-aggressive-panhandling goes back into the late 90s, at least. The problem with SF leadership is not skin color or reproductive plumbing. The problem is their unrealistic, economic-envy, and racist ideas.
Similarly, as folks have noted above, St. Louis has had crime problems for many years, if not decades. The current Mayor, Tishaura Jones, entered the office in April
2021. The previous mayor was Lyda Krewson, 4 years in office, and before her was Francis Slay, 16 years in office. Krewson and Slay are both white, and Slay is male, FWIW. Jones, Krewson, and Slay, for the terminally curious, were all born and raised in the US.