The number of parties depends on State election law and has nothing to do with ranked choice or proportional voting. For chicagotribune.com area it is laws in I

The number of parties depends on State election law and has nothing to do with ranked choice or proportional voting. For chicagotribune.com area it is laws in Illinois which say: - 'new political party shall become an "established political party"' and - Sec. 7-19. 'The primary ballot ..' shall be arranged and printed ...: 1. Designating words. At the top of the ballot "REPUBLICAN PRIMARY BALLOT"; "DEMOCRATIC PRIMARY BALLOT"' That is from https://www.ilga.gov/legislation/ilcs/ilcs5.asp?ActID=170&ChapterID=3 https://www.ilga.gov/legislation/ilcs/ilcs5.asp?ActID=170&Ch... It is State election law which creates the domination of the two-party major/minor system. It's simply hard-coded this way. Coders might say RTFM.