I could add screenshots but I'm sure everyone has run into the 3 province totemist Canada/USA/what have you recently.
A country needs 10 provinces to form USA or Canada, so they lost some provinces afterwards-
How has this still not been fixed after like 4 patches?
Probably because there are many more important issues. And maybe the developers don't even know about that. Your post is only the second time that I have seen this discussed(here, on reddit or on the steam forum). And I can't find any bug report about the topic. And this is not trivial to fix, because it happens due to a combination of factors:
- natives are prevented from forming colonial tags because of their tech group
- natives can reform to become a horde
- becoming a horde changes the tech group to nomadic, but doesn't allow the formation of colonial tags, because hordes are also prevent from doing it
- reforming into a horde lets the country keep their reform progress, so that they can immediately pass all reforms
- the AI sometimes chooses to reform out of a horde with the last reform and that changes their tech group to chinese
- natives can reach admin tech 10
- natives can get the required amount of provinces needed to form the colonial tags
- a non-horde with chinese tech group and admin tech 10 can form the colonial tags
None of these would be a problem in themselves and changing one of them would cause other issues.