Follow
"You are not allowed to support the Republican Party on this instance."
I saw something like that in an instance's rules.
It reminds me of how in the U.S., there are only really two political parties. In a lot of other countries, there are more.
@olives a lot of it has to do with the voting system used in the US and the federal structure that's presidential instead of parliamentary.
Thanks to the way it's organized voters will naturally tend to organize themselves into two parties to avoid wasting of votes.