Because the mod was not revised, I have added a simple version here.
Basically I have changed only 2 things:
1: Decentralized nations are not colonizable.
2: They have military, economy, politics and technologies (so they are playable like any other nation).

Remember, decentralized nations have a debuff from Paradox that weakens them a bit, so I left that vanilla.

Because of the simplicity this version is compatible with any patch

https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2948723968&searchtext=No+Decentralized+Nations

yeah can second the Kazakhs being wiped off the map thing. Now there is a big white splotch of uninhabitable land in the map of one of my games because I hadnt noticed. Couldnt find a way to fix it

Hello! The recent update made the Kazakhs vassal nations of Russia, but now the mod just wipes them off the map

Could you make a mod where the Bigger decetrelized nation are playble

can you update this?

was just trying to find a mod that did this for Igbo. This works too.

Weird, I just started a new game with this mod activated and Mexico still has Colonial Exploitation, not No Colonial Affairs. Any idea what may have happened?

Hello, create a mod for Kazakhs with only normal population, I'm like a Kazakh, I want to play for them

@AVE You're right, that can definitely be a problem in late game. I originally didn't want the mod to be to complex, but I willl look into this. Maybe I'll do this as an "extension mod", so that this mod works with other mods that do this kind of stuff.

Won't this mod slow down the game quite heavily and do it much faster than base game? Would it be possible to slow down the pop growth speed and building speed of these previously decentralized nations as to facilitate a faster game in the long term?

@CaliBlueBear I just updated it

@CaliBlueBear Thanks for the feedback! I will look into it tomorrow!

It would be awesome if this mod would automatically change all starting colonization laws to "No Colonial Affairs" so as not to waste bureaucracy and political effort trying to switch it. :)

@0xRegen I know that this mod breaks colonization. I wrote it in the description. You dont have to use it. Its meant to be used for timelapses and "experimental" gameplay. :)

Only Europe was civilized. Rest of the world has to be uncivilized or else colonialism can not take place in the game.

Thanks for this. It make the world a bit more interesting