I just want to say that this in itself is strange, what is now in the game. Look at Finland, in the photo. She declared independence in the outback, and is now there. Yes, increasing the number of troops would help Finland free all of its national territories, but AI itself is stupid and will capture all surrounding provinces, not just national ones. In the event that the whole territory of Finland declared independence, without a huge number of troops, this would lead to the same result as your version, only in a more realistic way.
yes there is a way,its the same for new countries
Go and find your flag online
Then just resize it(you know like all other flags are in the folders "flags" and "flagsH"
After that just find which is the tag of Ohio(go ingame,not in the files,editor,then game editor,then game civilizations and just write ohio,you will see the tag)
Then go to the game folder,and add the flags with for example if ohio's tag is "ohi" and you want to add communist flag you should make the flags "ohi_m"