Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?
This is your opportunity to ask questions. No question too simple or too silly.
Culture war topics are accepted, and proposals for a better intro post are appreciated.

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Notes -
The Civil war.
No, seriously, the Civil War. Historically, the last time we had what amounted to a multi-party election was the one involving Lincoln - there were four presidential canidates on the ballet, each a different party, each of whom received a sizable chunk of the electorate vote.
That entire instance kind of soured the notion of anything above and beyond two-party voting.
I appreciate your engagement but I don't see how this answers my question and is also the sort of response I usually get when I ask it. I'm not asking why there aren't more competitors in our 2 party system, I'm asking why there aren't fewer. Why at some point one party doesn't just happen to take an objectively superior or more functional viewpoint, and becomes the dominant political theory that benefits everyone better, and proceeds to rule forever.
There have been times where one party or the other sweeps the election, but the response is for the opposite party to adjust it's positions. Each party has the incentive to adapt their positions to the electorate, and because they are both doing this at the same time naturally it falls to around a 50/50 split. It's actually more like a 33% split because there's also a third of people who feel cut out of the process, are too apathetic or too adverse to both parties, and don't vote.
Given that we have more real-time feedback with internet sentiment and good polls, the parties adjust much faster now and it is unlikely there will be a sweep again.
That said, the real mystery is why the two parties are so different from each other. Or are they?
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This happened before- both major parties have done this, the other one just adapted.
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What makes you think that there aren't (fewer)?
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