Partisan PR Elections in the U.S.
Here, partisan means state and federal elections. Most of the content on this page falls in the realm of "imagine if..." But if you don't know about the 110 year cumulative voting experience (a length of time that is way beyond "experiment") for electing the Illinois House of Representatives, than you'll definitely want to check that piece out. Then there's New Hampshire, with by far the largest network of multimember state legislative districts in the country, which I believe presents an important opportunity for further study, beyond what I have begun to do with some sample analytical pieces; it's easier to imagine partisan dynamics in proportional multi-member districts if partisan block voting is already being used in multi-member districts. Which is exactly what the state RCV advocacy group there is doing.
Then there's the question of "Now What?" in response to the burgeoning interest in the US for a "viable third party;" advocates can either try and stuff a so-called third party into a structurally two party system - as with all the previous attempts - or begin considering and pursing a true multiparty democracy for these United States. This page will be adding content when the new Fair Representation Act is introduced to Congress later in 2021.