how to change the ruling party?

Please

For a country created via the country creator tool, under the Misc section, you can set ruling party, last election date, and a few other things.

To do it via an event/focus/etc.

set_politics = {

ruling_party = [ideology]

}

If your new ideology should (not) allow elections, add:

elections_allowed = yes

Swapping a democratic nation to a fascist one would look like:

set_politics = {

ruling_party = fascism

elections_allowed = no

}

thanks