I thought that was just "the government".
Edit: I checked, and it's simply called "the ruling party".
My bad.
In any case, I'm thinking the US needs a separate form of government called "Federalism" that is basically the same as democracy except you cannot call elections; they are called via event every 4 years to determine the ruling party. The mix of parties in the government could reshuffle every 2 years to increase the immersion (biannual Congressional elections), but that might be hard-coded and impossible to change.
If we wanted to take this further, the CSA could have a "Confederacy" government that automatically called elections every 6 years (and had a bonus to the opposition parties to represent the incumbency rules, maybe).
The USA and CSA by default would have their unique governments, and should a revolt away from them occur, we could code a unique decision to restore their original constitutions (i.e. only if you are the USA and you revolt from some other form of government to a Democracy, then you could enact a decision to switch to Federalism).