Racial representation and electoral-system reform in U.S. cities

Next month, Portland (OR) will announce the winners of its first elections under the single transferable vote (STV), AKA proportional ranked-choice voting. The effort to adopt this reform was, in part, an effort to make city council as diverse as the population it serves.
Will it? Or are other reforms the way to go? Time will tell, but here are some observations in the interim.
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