Max Provinces

Max Provinces
The max province count is the maximum number of provinces that a faction can have before the overextension penalty kicks in.

Currently, there is no way to increase the max province count (except for a few early game techs) without reforming your country into another country. The only way to gain more max provinces since there are no other options to is switching to a different country with more max provinces than the other.

The limit can be gone over, however, it is usually dangerous to do so extensively as it will start to cause untest to your nation. Having a ton of provinces over the maximum can surely cause trouble sometimes, especially earlier in the game, so try to keep yourself stable.