Green Party members elected to city councils, school boards, municipal offices
The duopolistic system and the political culture of the United States make it exceptionally hard for alternative parties to get a foothold.
One day there will be a breakthrough. If Ross Perot in 1994 had been more serious there could have been a Reform Party. If Ralph Nader in 2002 had been less of a loner and more of a party politico there could have been a growing Green Party. If Donald Trump in 2022 had gotten pushed out of the Republican Party and gone rogue there could have been a Patriot Party (heaven forbid!).
But circumstances will come together at some point where just the right opening and just the right personalities will coalesce to break open the system. I can’t imagine that a hundred years from now the sorry American electorate will still have only two significant choices election after election.