Note that I said district/state. Your senate has 2 seats for each state and the house has a seat for each district. This still means that there is no realistic

Note that I said district/state. Your senate has 2 seats for each state and the house has a seat for each district. This still means that there is no realistic way for a third party to get any sort of real power. Because the votes are arbitrarily divided among districts, only parties that have significant majorities have a chance of winning. Any third party in the USA has very little chance of winning any seat. Even if they have 10% support among the electorate it is unlikely that they'll get much seats. The nice thing about a system without districts is that smaller parties get power approximately in proportion to the votes they get. The coalitions you get in these systems are messy but more fair. It's a bit unrealistic to forbid people from forming political parties on these somewhat vague assertions. Reforming the election system to be more fair to smaller parties should have a bigger effect I think.