As you can see from the PR timeline on this site, with the American Proportional Representation League forming in 1893, and Ashtabula OH becoming the first American city to adopt PR in 1915.
Ryan Dunning has posted on his blog Fresno Ranked Voting an excerpt from Hoag & Hallett’s 1926 Proportional Representation describing the brief flowering of PR in Sacramento CA in the 1920s.
The court decision (read the post) was wrong at the time, and moot today, a shame, because Sacramento’s brief experience with STV-PR was entirely successful.
Read it and weep.