I am currently playing a game as the Iroquois Nation, and I have:
- Completed all native ideas
- Have a number of provinces bordering a westernized nation (France to the North)
- I have the Conquest of Paradise DLC installed and active.
- (Possibly Irrelevant) I am independently at level 6 administrative tech.
As you can see in the screenshot below, despite the above I still cannot change my government type. Does anyone know why or what the complete list of requirements is to change government types as a North American nation?
UPDATE: @CrusaderJ posited a very reasonable explanation that perhaps the French provinces were not cores, but sadly that is not the case as you can see in this here:
AND if that weren't enough, it appears that I'm bordered on the east by the Netherlands, also western, also touching a core province.