Cosmos1985
King
As far as I can see, that is no longer an option in 1.16.
You could, however, cheat with the world builder to regularly reset your failing stability. Or, more sustainable if you are basing your Greeks in Australia or America, or if you simply want to keep the Macedonian Empire alive in 600 AD? - just take the World Builder and add new core areas wherever your population centers are!
That just about sums it up yeah, I have to expand in order to stay alive, but I run out of historical areas sooner or later :/ All these years of playing, and apparently I am still too much of a noob to keep ancient empires alive throughout the game.