Noob question regarding government types

[tentaku]

I looked through the government types guide, and I just have a quick noob question to confirm.
Once i build allied/tributary line of government (as opposed to province/royal admin.), can I switch the government building back to the province type of govt building after my culture there increased to a certain point? Or I have to demolish the tributary government buildings before constructing my province govt. building

Also, regarding those hellen colonies, I am confused by the happiness bonus, so it grants 5% to all, but then there is a -5% upon some level of cultural percentage? How does it work

Thanks!

[Genghis Skahn]

You have to destroy the allied gov before being able to build a factional gov in the same location. The same is true for any government change, it always requires that the old government is first destroyed(unless it can upgrade into a new gov type, for example).

[tentaku]

You have to destroy the allied gov before being able to build a factional gov in the same location. The same is true for any government change, it always requires that the old government is first destroyed(unless it can upgrade into a new gov type, for example).

Thanks for answering!