STV is also totally compatible with polarization

On Friday, I showed NOMINATE scores for Cincinnati City Council members elected under permissive rules. Polarization was super low* for some years because, in each of those years, a lone wolf was able to play coalition kingmaker in a hung parliament.**

Now look at 1947, which is new in this plot, and watch those parties diverge. Yup. STV is totally compatible with high levels of polarization. (I never said it wasn’t.)

cincyThru1947

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Evolution of the American proportional representation movement

In seeking an explanation for why several cities once adopted PR-STV, I sometimes encounter the following hypothesis. Among myriad goo-goo reform ideas, PR was unusually obscure, and that’s why it only happened in 24 places.

Obscurity could not have been the cause of PR’s rarity, and I’ll show you why below.

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Really, the US chose its electoral rules in 1967

Entertain me for a moment while I present a conspiracy theory. Congress banned multi-member House districts in 1967 in order to curb the threat of proportional representation.
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