I am curious about this as well. At least in some cases, it seems to be due to “alternate facts”, e.g., https://lemmy.ca/comment/13198294

Ok, not a downvoter, but I’ll bite. A system with more than one party is more democratic than a system with a single party. Are you asking which of the two major parties in the US is the “second” party, making the US more democratic than if there were a single party? If so, I see why no one is answering. If not, perhaps you could clarify your question?